[legal] Relicense files under GPL2_OR_LATER_OR_UBDL

These files cannot be automatically relicensed by util/relicense.pl
since they either contain unusual but trivial contributions (such as
the addition of __nonnull function attributes), or contain lines
dating back to the initial git revision (and so require manual
knowledge of the code's origin).

Signed-off-by: Michael Brown <mcb30@ipxe.org>

106 files changed, 302 insertions, 114 deletions

diff --git a/src/arch/i386/core/patch_cf.S b/src/arch/i386/core/patch_cf.S
index 97a62f494..4365563fe 100644
--- a/src/arch/i386/core/patch_cf.S
+++ b/src/arch/i386/core/patch_cf.S
@@ -14,9 +14,13 @@
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ *
+ * You can also choose to distribute this program under the terms of
+ * the Unmodified Binary Distribution Licence (as given in the file
+ * COPYING.UBDL), provided that you have satisfied its requirements.
  */
 
-FILE_LICENCE ( GPL2_OR_LATER )
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL )
 
 	.text
 	.arch i386
diff --git a/src/arch/i386/core/relocate.c b/src/arch/i386/core/relocate.c
index 5fbf2d2c2..54ad387e4 100644
--- a/src/arch/i386/core/relocate.c
+++ b/src/arch/i386/core/relocate.c
@@ -8,7 +8,7 @@
  *
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 /*
  * The linker passes in the symbol _max_align, which is the alignment
diff --git a/src/arch/i386/firmware/pcbios/bios_console.c b/src/arch/i386/firmware/pcbios/bios_console.c
index bd73838b5..7b2f8ade4 100644
--- a/src/arch/i386/firmware/pcbios/bios_console.c
+++ b/src/arch/i386/firmware/pcbios/bios_console.c
@@ -15,9 +15,13 @@
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  * 02110-1301, USA.
+ *
+ * You can also choose to distribute this program under the terms of
+ * the Unmodified Binary Distribution Licence (as given in the file
+ * COPYING.UBDL), provided that you have satisfied its requirements.
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include <assert.h>
 #include <realmode.h>
diff --git a/src/arch/i386/firmware/pcbios/e820mangler.S b/src/arch/i386/firmware/pcbios/e820mangler.S
index cea17ef8e..d5d97b482 100644
--- a/src/arch/i386/firmware/pcbios/e820mangler.S
+++ b/src/arch/i386/firmware/pcbios/e820mangler.S
@@ -15,9 +15,13 @@
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  * 02110-1301, USA.
+ *
+ * You can also choose to distribute this program under the terms of
+ * the Unmodified Binary Distribution Licence (as given in the file
+ * COPYING.UBDL), provided that you have satisfied its requirements.
  */
 
-FILE_LICENCE ( GPL2_OR_LATER )
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL )
 
 	.text
 	.arch i386
diff --git a/src/arch/i386/firmware/pcbios/memmap.c b/src/arch/i386/firmware/pcbios/memmap.c
index 0937a7ce2..bcacecd6a 100644
--- a/src/arch/i386/firmware/pcbios/memmap.c
+++ b/src/arch/i386/firmware/pcbios/memmap.c
@@ -15,9 +15,13 @@
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  * 02110-1301, USA.
+ *
+ * You can also choose to distribute this program under the terms of
+ * the Unmodified Binary Distribution Licence (as given in the file
+ * COPYING.UBDL), provided that you have satisfied its requirements.
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include <stdint.h>
 #include <errno.h>
diff --git a/src/arch/i386/image/multiboot.c b/src/arch/i386/image/multiboot.c
index 86b0bc12d..0c85df708 100644
--- a/src/arch/i386/image/multiboot.c
+++ b/src/arch/i386/image/multiboot.c
@@ -15,9 +15,13 @@
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  * 02110-1301, USA.
+ *
+ * You can also choose to distribute this program under the terms of
+ * the Unmodified Binary Distribution Licence (as given in the file
+ * COPYING.UBDL), provided that you have satisfied its requirements.
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 /**
  * @file
diff --git a/src/arch/i386/include/bits/byteswap.h b/src/arch/i386/include/bits/byteswap.h
index 0d9cb967c..53b6a454d 100644
--- a/src/arch/i386/include/bits/byteswap.h
+++ b/src/arch/i386/include/bits/byteswap.h
@@ -9,7 +9,7 @@
 
 #include <stdint.h>
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 static inline __attribute__ (( always_inline, const )) uint16_t
 __bswap_variable_16 ( uint16_t x ) {
diff --git a/src/arch/i386/include/bits/stdint.h b/src/arch/i386/include/bits/stdint.h
index 8edf13192..fe1f9946a 100644
--- a/src/arch/i386/include/bits/stdint.h
+++ b/src/arch/i386/include/bits/stdint.h
@@ -1,7 +1,7 @@
 #ifndef _BITS_STDINT_H
 #define _BITS_STDINT_H
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 typedef __SIZE_TYPE__		size_t;
 typedef signed long		ssize_t;
diff --git a/src/arch/i386/include/bzimage.h b/src/arch/i386/include/bzimage.h
index 7e42e3188..4933ce5b1 100644
--- a/src/arch/i386/include/bzimage.h
+++ b/src/arch/i386/include/bzimage.h
@@ -1,7 +1,7 @@
 #ifndef _BZIMAGE_H
 #define _BZIMAGE_H
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include <stdint.h>
 
diff --git a/src/arch/i386/include/efi/ipxe/dhcp_arch.h b/src/arch/i386/include/efi/ipxe/dhcp_arch.h
index 184177219..c17c1ea5e 100644
--- a/src/arch/i386/include/efi/ipxe/dhcp_arch.h
+++ b/src/arch/i386/include/efi/ipxe/dhcp_arch.h
@@ -4,7 +4,7 @@
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License as
  * published by the Free Software Foundation; either version 2 of the
- * License, or any later version.
+ * License, or (at your option) any later version.
  *
  * This program is distributed in the hope that it will be useful, but
  * WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -13,7 +13,12 @@
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ *
+ * You can also choose to distribute this program under the terms of
+ * the Unmodified Binary Distribution Licence (as given in the file
+ * COPYING.UBDL), provided that you have satisfied its requirements.
  */
 
 #ifndef _DHCP_ARCH_H
@@ -24,7 +29,7 @@
  * Architecture-specific DHCP options
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include <ipxe/dhcp.h>
 
diff --git a/src/arch/i386/include/librm.h b/src/arch/i386/include/librm.h
index c8ba72b53..c37373ddc 100644
--- a/src/arch/i386/include/librm.h
+++ b/src/arch/i386/include/librm.h
@@ -1,7 +1,7 @@
 #ifndef LIBRM_H
 #define LIBRM_H
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 /* Segment selectors as used in our protected-mode GDTs.
  *
diff --git a/src/arch/i386/include/limits.h b/src/arch/i386/include/limits.h
index 031b6c57a..bb48b75ab 100644
--- a/src/arch/i386/include/limits.h
+++ b/src/arch/i386/include/limits.h
@@ -1,7 +1,7 @@
 #ifndef LIMITS_H
 #define LIMITS_H	1
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 /* Number of bits in a `char' */
 #define CHAR_BIT	8
diff --git a/src/arch/i386/include/pcbios/ipxe/dhcp_arch.h b/src/arch/i386/include/pcbios/ipxe/dhcp_arch.h
index a36d9cfa1..e07e4c192 100644
--- a/src/arch/i386/include/pcbios/ipxe/dhcp_arch.h
+++ b/src/arch/i386/include/pcbios/ipxe/dhcp_arch.h
@@ -4,7 +4,7 @@
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License as
  * published by the Free Software Foundation; either version 2 of the
- * License, or any later version.
+ * License, or (at your option) any later version.
  *
  * This program is distributed in the hope that it will be useful, but
  * WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -13,7 +13,12 @@
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ *
+ * You can also choose to distribute this program under the terms of
+ * the Unmodified Binary Distribution Licence (as given in the file
+ * COPYING.UBDL), provided that you have satisfied its requirements.
  */
 
 #ifndef _DHCP_ARCH_H
@@ -24,7 +29,7 @@
  * Architecture-specific DHCP options
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include <ipxe/dhcp.h>
 
diff --git a/src/arch/i386/include/pxe.h b/src/arch/i386/include/pxe.h
index b95b0cce5..66d752683 100644
--- a/src/arch/i386/include/pxe.h
+++ b/src/arch/i386/include/pxe.h
@@ -1,7 +1,7 @@
 #ifndef PXE_H
 #define PXE_H
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include "pxe_types.h"
 #include "pxe_error.h"
diff --git a/src/arch/i386/include/pxe_call.h b/src/arch/i386/include/pxe_call.h
index 45af46549..cbd548318 100644
--- a/src/arch/i386/include/pxe_call.h
+++ b/src/arch/i386/include/pxe_call.h
@@ -6,7 +6,7 @@
  * PXE API entry point
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include <pxe_api.h>
 #include <realmode.h>
diff --git a/src/arch/i386/include/registers.h b/src/arch/i386/include/registers.h
index 06d236524..d9aa3c376 100644
--- a/src/arch/i386/include/registers.h
+++ b/src/arch/i386/include/registers.h
@@ -10,7 +10,7 @@
  *
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include <stdint.h>
 
diff --git a/src/arch/i386/interface/pcbios/bios_timer.c b/src/arch/i386/interface/pcbios/bios_timer.c
index 65bbf9e01..3299c9aae 100644
--- a/src/arch/i386/interface/pcbios/bios_timer.c
+++ b/src/arch/i386/interface/pcbios/bios_timer.c
@@ -15,9 +15,13 @@
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  * 02110-1301, USA.
+ *
+ * You can also choose to distribute this program under the terms of
+ * the Unmodified Binary Distribution Licence (as given in the file
+ * COPYING.UBDL), provided that you have satisfied its requirements.
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 /** @file
  *
diff --git a/src/arch/i386/interface/pxe/pxe_call.c b/src/arch/i386/interface/pxe/pxe_call.c
index 657d47b6c..9703733c1 100644
--- a/src/arch/i386/interface/pxe/pxe_call.c
+++ b/src/arch/i386/interface/pxe/pxe_call.c
@@ -15,9 +15,13 @@
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  * 02110-1301, USA.
+ *
+ * You can also choose to distribute this program under the terms of
+ * the Unmodified Binary Distribution Licence (as given in the file
+ * COPYING.UBDL), provided that you have satisfied its requirements.
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include <ipxe/uaccess.h>
 #include <ipxe/init.h>
diff --git a/src/arch/i386/interface/pxe/pxe_preboot.c b/src/arch/i386/interface/pxe/pxe_preboot.c
index 534352b2b..7cb82f74e 100644
--- a/src/arch/i386/interface/pxe/pxe_preboot.c
+++ b/src/arch/i386/interface/pxe/pxe_preboot.c
@@ -22,9 +22,13 @@
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  * 02110-1301, USA.
+ *
+ * You can also choose to distribute this program under the terms of
+ * the Unmodified Binary Distribution Licence (as given in the file
+ * COPYING.UBDL), provided that you have satisfied its requirements.
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include <stdint.h>
 #include <string.h>
diff --git a/src/arch/i386/interface/pxe/pxe_tftp.c b/src/arch/i386/interface/pxe/pxe_tftp.c
index 46119c9ba..9ec3e96e7 100644
--- a/src/arch/i386/interface/pxe/pxe_tftp.c
+++ b/src/arch/i386/interface/pxe/pxe_tftp.c
@@ -21,9 +21,13 @@
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  * 02110-1301, USA.
+ *
+ * You can also choose to distribute this program under the terms of
+ * the Unmodified Binary Distribution Licence (as given in the file
+ * COPYING.UBDL), provided that you have satisfied its requirements.
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include <stdlib.h>
 #include <stdio.h>
diff --git a/src/arch/i386/interface/pxe/pxe_undi.c b/src/arch/i386/interface/pxe/pxe_undi.c
index 29e586ed2..2eb68178a 100644
--- a/src/arch/i386/interface/pxe/pxe_undi.c
+++ b/src/arch/i386/interface/pxe/pxe_undi.c
@@ -21,9 +21,13 @@
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  * 02110-1301, USA.
+ *
+ * You can also choose to distribute this program under the terms of
+ * the Unmodified Binary Distribution Licence (as given in the file
+ * COPYING.UBDL), provided that you have satisfied its requirements.
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include <stdint.h>
 #include <stdio.h>
diff --git a/src/arch/i386/prefix/libprefix.S b/src/arch/i386/prefix/libprefix.S
index 5a2dff57f..00ce3fb99 100644
--- a/src/arch/i386/prefix/libprefix.S
+++ b/src/arch/i386/prefix/libprefix.S
@@ -16,9 +16,13 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  * 02110-1301, USA.
  *
+ * You can also choose to distribute this program under the terms of
+ * the Unmodified Binary Distribution Licence (as given in the file
+ * COPYING.UBDL), provided that you have satisfied its requirements.
+ *
  */
 
-FILE_LICENCE ( GPL2_OR_LATER )
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL )
 
 	.arch i386
 
diff --git a/src/arch/i386/prefix/romprefix.S b/src/arch/i386/prefix/romprefix.S
index cac8075e5..0ad6e16d8 100644
--- a/src/arch/i386/prefix/romprefix.S
+++ b/src/arch/i386/prefix/romprefix.S
@@ -6,7 +6,7 @@
  * table so using a noticeable amount of stack space is a no-no.
  */
 
-FILE_LICENCE ( GPL2_OR_LATER )
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL )
 
 #include <config/general.h>
 #include <config/branding.h>
diff --git a/src/arch/i386/prefix/undiloader.S b/src/arch/i386/prefix/undiloader.S
index 74bb59041..5cace44b7 100644
--- a/src/arch/i386/prefix/undiloader.S
+++ b/src/arch/i386/prefix/undiloader.S
@@ -1,4 +1,4 @@
-FILE_LICENCE ( GPL2_OR_LATER )
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL )
 
 	.text
 	.code16
diff --git a/src/arch/i386/transitions/librm.S b/src/arch/i386/transitions/librm.S
index 2e447b030..863e22415 100644
--- a/src/arch/i386/transitions/librm.S
+++ b/src/arch/i386/transitions/librm.S
@@ -5,7 +5,7 @@
  *
  */
 
-FILE_LICENCE ( GPL2_OR_LATER )
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL )
 
 /* Drag in local definitions */
 #include "librm.h"
diff --git a/src/arch/i386/transitions/librm_mgmt.c b/src/arch/i386/transitions/librm_mgmt.c
index cc4765de2..5eab7bed0 100644
--- a/src/arch/i386/transitions/librm_mgmt.c
+++ b/src/arch/i386/transitions/librm_mgmt.c
@@ -5,7 +5,7 @@
  *
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include <stdint.h>
 #include <ipxe/profile.h>
diff --git a/src/arch/x86/core/x86_tcpip.c b/src/arch/x86/core/x86_tcpip.c
index 8a4ce5152..88042f5f7 100644
--- a/src/arch/x86/core/x86_tcpip.c
+++ b/src/arch/x86/core/x86_tcpip.c
@@ -15,9 +15,13 @@
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  * 02110-1301, USA.
+ *
+ * You can also choose to distribute this program under the terms of
+ * the Unmodified Binary Distribution Licence (as given in the file
+ * COPYING.UBDL), provided that you have satisfied its requirements.
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 /** @file
  *
diff --git a/src/arch/x86/include/bits/errfile.h b/src/arch/x86/include/bits/errfile.h
index 5fce86af4..9ca849d52 100644
--- a/src/arch/x86/include/bits/errfile.h
+++ b/src/arch/x86/include/bits/errfile.h
@@ -1,7 +1,7 @@
 #ifndef _BITS_ERRFILE_H
 #define _BITS_ERRFILE_H
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 /**
  * @addtogroup errfile Error file identifiers
diff --git a/src/arch/x86/include/bits/string.h b/src/arch/x86/include/bits/string.h
index b6a422ec5..c26fe30d5 100644
--- a/src/arch/x86/include/bits/string.h
+++ b/src/arch/x86/include/bits/string.h
@@ -18,9 +18,13 @@
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  * 02110-1301, USA.
+ *
+ * You can also choose to distribute this program under the terms of
+ * the Unmodified Binary Distribution Licence (as given in the file
+ * COPYING.UBDL), provided that you have satisfied its requirements.
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 /** @file
  *
diff --git a/src/arch/x86/include/linux/ipxe/dhcp_arch.h b/src/arch/x86/include/linux/ipxe/dhcp_arch.h
index e83fd9d87..d60905f22 100644
--- a/src/arch/x86/include/linux/ipxe/dhcp_arch.h
+++ b/src/arch/x86/include/linux/ipxe/dhcp_arch.h
@@ -4,7 +4,7 @@
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License as
  * published by the Free Software Foundation; either version 2 of the
- * License, or any later version.
+ * License, or (at your option) any later version.
  *
  * This program is distributed in the hope that it will be useful, but
  * WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -13,7 +13,12 @@
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ *
+ * You can also choose to distribute this program under the terms of
+ * the Unmodified Binary Distribution Licence (as given in the file
+ * COPYING.UBDL), provided that you have satisfied its requirements.
  */
 
 #ifndef _LINUX_DHCP_ARCH_H
@@ -24,7 +29,7 @@
  * Architecture-specific DHCP options
  */
 
-FILE_LICENCE(GPL2_OR_LATER);
+FILE_LICENCE(GPL2_OR_LATER_OR_UBDL);
 
 #include <ipxe/dhcp.h>
 
diff --git a/src/arch/x86/include/pic8259.h b/src/arch/x86/include/pic8259.h
index 0d02266da..f02e62909 100644
--- a/src/arch/x86/include/pic8259.h
+++ b/src/arch/x86/include/pic8259.h
@@ -4,7 +4,7 @@
  * Initially written by Michael Brown (mcb30).
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #ifndef PIC8259_H
 #define PIC8259_H
diff --git a/src/arch/x86_64/include/efi/ipxe/dhcp_arch.h b/src/arch/x86_64/include/efi/ipxe/dhcp_arch.h
index 9a4790fdc..6511c1ad3 100644
--- a/src/arch/x86_64/include/efi/ipxe/dhcp_arch.h
+++ b/src/arch/x86_64/include/efi/ipxe/dhcp_arch.h
@@ -4,7 +4,7 @@
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License as
  * published by the Free Software Foundation; either version 2 of the
- * License, or any later version.
+ * License, or (at your option) any later version.
  *
  * This program is distributed in the hope that it will be useful, but
  * WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -13,7 +13,12 @@
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ *
+ * You can also choose to distribute this program under the terms of
+ * the Unmodified Binary Distribution Licence (as given in the file
+ * COPYING.UBDL), provided that you have satisfied its requirements.
  */
 
 #ifndef _DHCP_ARCH_H
@@ -24,7 +29,7 @@
  * Architecture-specific DHCP options
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include <ipxe/dhcp.h>
 
diff --git a/src/config/colour.h b/src/config/colour.h
index 57d20c1db..98198f12f 100644
--- a/src/config/colour.h
+++ b/src/config/colour.h
@@ -7,7 +7,7 @@
  *
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #define COLOR_NORMAL_FG		COLOR_WHITE
 #define COLOR_NORMAL_BG		COLOR_BLUE
diff --git a/src/config/config.c b/src/config/config.c
index a84f78ac3..346f79bfc 100644
--- a/src/config/config.c
+++ b/src/config/config.c
@@ -13,9 +13,13 @@
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  * 02110-1301, USA.
+ *
+ * You can also choose to distribute this program under the terms of
+ * the Unmodified Binary Distribution Licence (as given in the file
+ * COPYING.UBDL), provided that you have satisfied its requirements.
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include <config/general.h>
 #include <config/console.h>
diff --git a/src/config/config_romprefix.c b/src/config/config_romprefix.c
index 7a133641f..ad6f31f85 100644
--- a/src/config/config_romprefix.c
+++ b/src/config/config_romprefix.c
@@ -13,9 +13,13 @@
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  * 02110-1301, USA.
+ *
+ * You can also choose to distribute this program under the terms of
+ * the Unmodified Binary Distribution Licence (as given in the file
+ * COPYING.UBDL), provided that you have satisfied its requirements.
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include <config/general.h>
 
diff --git a/src/config/defaults/pcbios.h b/src/config/defaults/pcbios.h
index ef20c3604..425e4a0d0 100644
--- a/src/config/defaults/pcbios.h
+++ b/src/config/defaults/pcbios.h
@@ -7,7 +7,7 @@
  *
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #define UACCESS_LIBRM
 #define IOAPI_X86
diff --git a/src/config/general.h b/src/config/general.h
index 8ea10c4b7..65c1f8554 100644
--- a/src/config/general.h
+++ b/src/config/general.h
@@ -7,7 +7,7 @@
  *
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include <config/defaults.h>
 
diff --git a/src/core/bitmap.c b/src/core/bitmap.c
index 0d1152327..2aac33870 100644
--- a/src/core/bitmap.c
+++ b/src/core/bitmap.c
@@ -15,9 +15,13 @@
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  * 02110-1301, USA.
+ *
+ * You can also choose to distribute this program under the terms of
+ * the Unmodified Binary Distribution Licence (as given in the file
+ * COPYING.UBDL), provided that you have satisfied its requirements.
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include <errno.h>
 #include <ipxe/bitmap.h>
diff --git a/src/core/cwuri.c b/src/core/cwuri.c
index 5865552a0..612f0b179 100644
--- a/src/core/cwuri.c
+++ b/src/core/cwuri.c
@@ -15,9 +15,13 @@
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  * 02110-1301, USA.
+ *
+ * You can also choose to distribute this program under the terms of
+ * the Unmodified Binary Distribution Licence (as given in the file
+ * COPYING.UBDL), provided that you have satisfied its requirements.
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include <stddef.h>
 #include <ipxe/uri.h>
diff --git a/src/core/downloader.c b/src/core/downloader.c
index ec69db6b1..5ec6b3b72 100644
--- a/src/core/downloader.c
+++ b/src/core/downloader.c
@@ -15,9 +15,13 @@
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  * 02110-1301, USA.
+ *
+ * You can also choose to distribute this program under the terms of
+ * the Unmodified Binary Distribution Licence (as given in the file
+ * COPYING.UBDL), provided that you have satisfied its requirements.
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include <stdlib.h>
 #include <errno.h>
diff --git a/src/core/image.c b/src/core/image.c
index ec4480238..365e4d801 100644
--- a/src/core/image.c
+++ b/src/core/image.c
@@ -15,9 +15,13 @@
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  * 02110-1301, USA.
+ *
+ * You can also choose to distribute this program under the terms of
+ * the Unmodified Binary Distribution Licence (as given in the file
+ * COPYING.UBDL), provided that you have satisfied its requirements.
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include <stddef.h>
 #include <string.h>
diff --git a/src/core/main.c b/src/core/main.c
index db09e4c39..97394d71d 100644
--- a/src/core/main.c
+++ b/src/core/main.c
@@ -12,7 +12,7 @@ Literature dealing with the network protocols:
 
 **************************************************************************/
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include <stddef.h>
 #include <stdio.h>
diff --git a/src/core/posix_io.c b/src/core/posix_io.c
index 8460d0f51..35b52beeb 100644
--- a/src/core/posix_io.c
+++ b/src/core/posix_io.c
@@ -15,9 +15,13 @@
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  * 02110-1301, USA.
+ *
+ * You can also choose to distribute this program under the terms of
+ * the Unmodified Binary Distribution Licence (as given in the file
+ * COPYING.UBDL), provided that you have satisfied its requirements.
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include <stdlib.h>
 #include <string.h>
diff --git a/src/core/refcnt.c b/src/core/refcnt.c
index 68a86120e..47c975a0b 100644
--- a/src/core/refcnt.c
+++ b/src/core/refcnt.c
@@ -15,9 +15,13 @@
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  * 02110-1301, USA.
+ *
+ * You can also choose to distribute this program under the terms of
+ * the Unmodified Binary Distribution Licence (as given in the file
+ * COPYING.UBDL), provided that you have satisfied its requirements.
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include <stdlib.h>
 #include <ipxe/refcnt.h>
diff --git a/src/core/resolv.c b/src/core/resolv.c
index d59a8c0ad..1e3182b0b 100644
--- a/src/core/resolv.c
+++ b/src/core/resolv.c
@@ -15,9 +15,13 @@
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  * 02110-1301, USA.
+ *
+ * You can also choose to distribute this program under the terms of
+ * the Unmodified Binary Distribution Licence (as given in the file
+ * COPYING.UBDL), provided that you have satisfied its requirements.
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include <stdint.h>
 #include <stdlib.h>
diff --git a/src/core/timer.c b/src/core/timer.c
index 18c2b2849..dbd89f12b 100644
--- a/src/core/timer.c
+++ b/src/core/timer.c
@@ -15,9 +15,13 @@
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  * 02110-1301, USA.
+ *
+ * You can also choose to distribute this program under the terms of
+ * the Unmodified Binary Distribution Licence (as given in the file
+ * COPYING.UBDL), provided that you have satisfied its requirements.
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include <unistd.h>
 
diff --git a/src/core/uri.c b/src/core/uri.c
index d60f5d2b7..3b5f270fe 100644
--- a/src/core/uri.c
+++ b/src/core/uri.c
@@ -15,9 +15,13 @@
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  * 02110-1301, USA.
+ *
+ * You can also choose to distribute this program under the terms of
+ * the Unmodified Binary Distribution Licence (as given in the file
+ * COPYING.UBDL), provided that you have satisfied its requirements.
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 /** @file
  *
diff --git a/src/core/vsprintf.c b/src/core/vsprintf.c
index 54811b11b..cb3bec5dd 100644
--- a/src/core/vsprintf.c
+++ b/src/core/vsprintf.c
@@ -15,9 +15,13 @@
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  * 02110-1301, USA.
+ *
+ * You can also choose to distribute this program under the terms of
+ * the Unmodified Binary Distribution Licence (as given in the file
+ * COPYING.UBDL), provided that you have satisfied its requirements.
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include <stddef.h>
 #include <stdarg.h>
diff --git a/src/drivers/bus/pci.c b/src/drivers/bus/pci.c
index f861d4525..7832ef06d 100644
--- a/src/drivers/bus/pci.c
+++ b/src/drivers/bus/pci.c
@@ -18,9 +18,13 @@
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  * 02110-1301, USA.
+ *
+ * You can also choose to distribute this program under the terms of
+ * the Unmodified Binary Distribution Licence (as given in the file
+ * COPYING.UBDL), provided that you have satisfied its requirements.
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include <stdint.h>
 #include <stdlib.h>
diff --git a/src/drivers/bus/pciextra.c b/src/drivers/bus/pciextra.c
index c4417e0cb..042f75615 100644
--- a/src/drivers/bus/pciextra.c
+++ b/src/drivers/bus/pciextra.c
@@ -1,4 +1,4 @@
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include <stdint.h>
 #include <ipxe/pci.h>
diff --git a/src/hci/editstring.c b/src/hci/editstring.c
index 5f6f04d51..8cbce0767 100644
--- a/src/hci/editstring.c
+++ b/src/hci/editstring.c
@@ -15,9 +15,13 @@
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  * 02110-1301, USA.
+ *
+ * You can also choose to distribute this program under the terms of
+ * the Unmodified Binary Distribution Licence (as given in the file
+ * COPYING.UBDL), provided that you have satisfied its requirements.
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include <assert.h>
 #include <string.h>
diff --git a/src/hci/tui/menu_ui.c b/src/hci/tui/menu_ui.c
index 0a9566def..13bdf65e1 100644
--- a/src/hci/tui/menu_ui.c
+++ b/src/hci/tui/menu_ui.c
@@ -15,9 +15,13 @@
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  * 02110-1301, USA.
+ *
+ * You can also choose to distribute this program under the terms of
+ * the Unmodified Binary Distribution Licence (as given in the file
+ * COPYING.UBDL), provided that you have satisfied its requirements.
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 /** @file
  *
diff --git a/src/image/embedded.c b/src/image/embedded.c
index 6358378fb..48dd86851 100644
--- a/src/image/embedded.c
+++ b/src/image/embedded.c
@@ -6,7 +6,7 @@
  * fetching over the network.
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include <string.h>
 #include <ipxe/image.h>
diff --git a/src/include/curses.h b/src/include/curses.h
index f16f9d7d0..04060fe27 100644
--- a/src/include/curses.h
+++ b/src/include/curses.h
@@ -11,7 +11,7 @@
  *
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #undef  ERR
 #define ERR	(-1)
diff --git a/src/include/hci/ifmgmt_cmd.h b/src/include/hci/ifmgmt_cmd.h
index 913b911d8..5debf85c2 100644
--- a/src/include/hci/ifmgmt_cmd.h
+++ b/src/include/hci/ifmgmt_cmd.h
@@ -15,12 +15,16 @@
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  * 02110-1301, USA.
+ *
+ * You can also choose to distribute this program under the terms of
+ * the Unmodified Binary Distribution Licence (as given in the file
+ * COPYING.UBDL), provided that you have satisfied its requirements.
  */
 
 #ifndef _IFMGMT_CMD_H
 #define _IFMGMT_CMD_H
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include <ipxe/parseopt.h>
 
diff --git a/src/include/ipxe/arp.h b/src/include/ipxe/arp.h
index e30ae6b76..93195010a 100644
--- a/src/include/ipxe/arp.h
+++ b/src/include/ipxe/arp.h
@@ -7,7 +7,7 @@
  *
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include <ipxe/tables.h>
 #include <ipxe/netdevice.h>
diff --git a/src/include/ipxe/bitmap.h b/src/include/ipxe/bitmap.h
index b18584c1f..38aca694b 100644
--- a/src/include/ipxe/bitmap.h
+++ b/src/include/ipxe/bitmap.h
@@ -7,7 +7,7 @@
  *
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include <stdint.h>
 #include <stddef.h>
diff --git a/src/include/ipxe/blockdev.h b/src/include/ipxe/blockdev.h
index 9f0a9f787..418c43004 100644
--- a/src/include/ipxe/blockdev.h
+++ b/src/include/ipxe/blockdev.h
@@ -8,7 +8,7 @@
  *
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include <stdint.h>
 #include <ipxe/uaccess.h>
diff --git a/src/include/ipxe/crc32.h b/src/include/ipxe/crc32.h
index 38ac1b31f..30d2fe66c 100644
--- a/src/include/ipxe/crc32.h
+++ b/src/include/ipxe/crc32.h
@@ -1,7 +1,7 @@
 #ifndef _IPXE_CRC32_H
 #define _IPXE_CRC32_H
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include <stdint.h>
 
diff --git a/src/include/ipxe/crypto.h b/src/include/ipxe/crypto.h
index 3eda5ec6e..fc0d8b22b 100644
--- a/src/include/ipxe/crypto.h
+++ b/src/include/ipxe/crypto.h
@@ -7,7 +7,7 @@
  *
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include <stdint.h>
 #include <stddef.h>
diff --git a/src/include/ipxe/dhcp.h b/src/include/ipxe/dhcp.h
index a35794bdd..a11db3497 100644
--- a/src/include/ipxe/dhcp.h
+++ b/src/include/ipxe/dhcp.h
@@ -7,7 +7,7 @@
  *
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include <stdint.h>
 #include <stdarg.h>
diff --git a/src/include/ipxe/editbox.h b/src/include/ipxe/editbox.h
index 9122dbbf3..2c70e0b6b 100644
--- a/src/include/ipxe/editbox.h
+++ b/src/include/ipxe/editbox.h
@@ -7,7 +7,7 @@
  *
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include <curses.h>
 #include <ipxe/editstring.h>
diff --git a/src/include/ipxe/editstring.h b/src/include/ipxe/editstring.h
index 2ef546a63..a00a8adaa 100644
--- a/src/include/ipxe/editstring.h
+++ b/src/include/ipxe/editstring.h
@@ -7,7 +7,7 @@
  *
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 /** An editable string */
 struct edit_string {
diff --git a/src/include/ipxe/errfile.h b/src/include/ipxe/errfile.h
index 353d8ca3a..a71a60354 100644
--- a/src/include/ipxe/errfile.h
+++ b/src/include/ipxe/errfile.h
@@ -7,7 +7,7 @@
  *
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include <bits/errfile.h>
 
diff --git a/src/include/ipxe/ethernet.h b/src/include/ipxe/ethernet.h
index d1263d7c3..dd04e00ce 100644
--- a/src/include/ipxe/ethernet.h
+++ b/src/include/ipxe/ethernet.h
@@ -7,7 +7,7 @@
  *
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include <stdint.h>
 #include <ipxe/netdevice.h>
diff --git a/src/include/ipxe/features.h b/src/include/ipxe/features.h
index d8b8b2184..e86a2d226 100644
--- a/src/include/ipxe/features.h
+++ b/src/include/ipxe/features.h
@@ -11,7 +11,7 @@
  *
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 /**
  * @defgroup featurecat Feature categories
diff --git a/src/include/ipxe/fragment.h b/src/include/ipxe/fragment.h
index e311ad1e4..0069e5e08 100644
--- a/src/include/ipxe/fragment.h
+++ b/src/include/ipxe/fragment.h
@@ -7,7 +7,7 @@
  *
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include <stdint.h>
 #include <ipxe/list.h>
diff --git a/src/include/ipxe/http.h b/src/include/ipxe/http.h
index cf8c0c7fa..421598b54 100644
--- a/src/include/ipxe/http.h
+++ b/src/include/ipxe/http.h
@@ -7,7 +7,7 @@
  *
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 /** HTTP default port */
 #define HTTP_PORT 80
diff --git a/src/include/ipxe/if_ether.h b/src/include/ipxe/if_ether.h
index a7e237349..58d91b976 100644
--- a/src/include/ipxe/if_ether.h
+++ b/src/include/ipxe/if_ether.h
@@ -1,7 +1,7 @@
 #ifndef	_IPXE_IF_ETHER_H
 #define	_IPXE_IF_ETHER_H
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include <stdint.h>
 
diff --git a/src/include/ipxe/in.h b/src/include/ipxe/in.h
index de96ca22a..75f23123d 100644
--- a/src/include/ipxe/in.h
+++ b/src/include/ipxe/in.h
@@ -1,7 +1,7 @@
 #ifndef	_IPXE_IN_H
 #define	_IPXE_IN_H
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include <stdint.h>
 #include <ipxe/socket.h>
diff --git a/src/include/ipxe/init.h b/src/include/ipxe/init.h
index 19c5925bf..e051dc6cd 100644
--- a/src/include/ipxe/init.h
+++ b/src/include/ipxe/init.h
@@ -1,7 +1,7 @@
 #ifndef _IPXE_INIT_H
 #define _IPXE_INIT_H
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include <ipxe/tables.h>
 
diff --git a/src/include/ipxe/io.h b/src/include/ipxe/io.h
index 29ccfd1fa..af767915d 100644
--- a/src/include/ipxe/io.h
+++ b/src/include/ipxe/io.h
@@ -16,7 +16,7 @@
  * the address parameter.
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include <stdint.h>
 #include <ipxe/api.h>
diff --git a/src/include/ipxe/iobuf.h b/src/include/ipxe/iobuf.h
index d7c10ab44..27d285d44 100644
--- a/src/include/ipxe/iobuf.h
+++ b/src/include/ipxe/iobuf.h
@@ -7,7 +7,7 @@
  *
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include <stdint.h>
 #include <assert.h>
diff --git a/src/include/ipxe/ip.h b/src/include/ipxe/ip.h
index 1a93a552e..285be6dcd 100644
--- a/src/include/ipxe/ip.h
+++ b/src/include/ipxe/ip.h
@@ -7,7 +7,7 @@
  *
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include <stdint.h>
 #include <ipxe/in.h>
diff --git a/src/include/ipxe/isa_ids.h b/src/include/ipxe/isa_ids.h
index 1faf1148d..d815bda34 100644
--- a/src/include/ipxe/isa_ids.h
+++ b/src/include/ipxe/isa_ids.h
@@ -19,7 +19,7 @@
  * the underlying "meaning" is big-endian.
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include <byteswap.h>
 
diff --git a/src/include/ipxe/netdevice.h b/src/include/ipxe/netdevice.h
index f471e2519..8e615c941 100644
--- a/src/include/ipxe/netdevice.h
+++ b/src/include/ipxe/netdevice.h
@@ -7,7 +7,7 @@
  *
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include <stdint.h>
 #include <ipxe/list.h>
diff --git a/src/include/ipxe/rarp.h b/src/include/ipxe/rarp.h
index f84301a43..9054db21a 100644
--- a/src/include/ipxe/rarp.h
+++ b/src/include/ipxe/rarp.h
@@ -7,7 +7,7 @@
  *
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include <ipxe/netdevice.h>
 
diff --git a/src/include/ipxe/refcnt.h b/src/include/ipxe/refcnt.h
index 0e8b8658c..7f489abc9 100644
--- a/src/include/ipxe/refcnt.h
+++ b/src/include/ipxe/refcnt.h
@@ -7,7 +7,7 @@
  *
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include <stddef.h>
 #include <assert.h>
diff --git a/src/include/ipxe/settings.h b/src/include/ipxe/settings.h
index d6929ecd0..45d600b20 100644
--- a/src/include/ipxe/settings.h
+++ b/src/include/ipxe/settings.h
@@ -7,7 +7,7 @@
  *
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include <stdint.h>
 #include <ipxe/tables.h>
diff --git a/src/include/ipxe/smbios.h b/src/include/ipxe/smbios.h
index ef5892a21..24b05ed62 100644
--- a/src/include/ipxe/smbios.h
+++ b/src/include/ipxe/smbios.h
@@ -7,7 +7,7 @@
  *
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include <stdint.h>
 #include <ipxe/api.h>
diff --git a/src/include/ipxe/tcp.h b/src/include/ipxe/tcp.h
index 9baa6391c..f12b4283f 100644
--- a/src/include/ipxe/tcp.h
+++ b/src/include/ipxe/tcp.h
@@ -9,7 +9,7 @@
  *
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include <ipxe/tcpip.h>
 
diff --git a/src/include/ipxe/tcpip.h b/src/include/ipxe/tcpip.h
index 200630d6b..73a7bffd3 100644
--- a/src/include/ipxe/tcpip.h
+++ b/src/include/ipxe/tcpip.h
@@ -7,7 +7,7 @@
  *
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include <stdint.h>
 #include <ipxe/socket.h>
diff --git a/src/include/ipxe/udp.h b/src/include/ipxe/udp.h
index 5717ef213..7b0de4dc0 100644
--- a/src/include/ipxe/udp.h
+++ b/src/include/ipxe/udp.h
@@ -9,7 +9,7 @@
  *
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include <stddef.h>
 #include <ipxe/iobuf.h>
diff --git a/src/include/ipxe/uri.h b/src/include/ipxe/uri.h
index fb7728aa0..00e5a24c4 100644
--- a/src/include/ipxe/uri.h
+++ b/src/include/ipxe/uri.h
@@ -7,7 +7,7 @@
  *
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include <stddef.h>
 #include <stdlib.h>
diff --git a/src/include/ipxe/vlan.h b/src/include/ipxe/vlan.h
index 083c21916..439e0c16d 100644
--- a/src/include/ipxe/vlan.h
+++ b/src/include/ipxe/vlan.h
@@ -8,7 +8,7 @@
  *
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 /** A VLAN header */
 struct vlan_header {
diff --git a/src/include/readline/readline.h b/src/include/readline/readline.h
index 0449a3f98..afafbbdf5 100644
--- a/src/include/readline/readline.h
+++ b/src/include/readline/readline.h
@@ -7,7 +7,7 @@
  *
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 /** A readline history entry */
 struct readline_history_entry {
diff --git a/src/include/stdint.h b/src/include/stdint.h
index 8cc9b84a5..0a239a517 100644
--- a/src/include/stdint.h
+++ b/src/include/stdint.h
@@ -1,7 +1,7 @@
 #ifndef _STDINT_H
 #define _STDINT_H
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 /*
  * This is a standard predefined macro on all gcc's I've seen. It's
diff --git a/src/include/stdlib.h b/src/include/stdlib.h
index 819b87b39..d7748a07e 100644
--- a/src/include/stdlib.h
+++ b/src/include/stdlib.h
@@ -1,7 +1,7 @@
 #ifndef STDLIB_H
 #define STDLIB_H
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include <stdint.h>
 #include <assert.h>
diff --git a/src/include/usr/autoboot.h b/src/include/usr/autoboot.h
index bc51aae79..c0603a0a3 100644
--- a/src/include/usr/autoboot.h
+++ b/src/include/usr/autoboot.h
@@ -7,7 +7,7 @@
  *
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include <ipxe/device.h>
 
diff --git a/src/include/wchar.h b/src/include/wchar.h
index ba349aae8..d054b8d5b 100644
--- a/src/include/wchar.h
+++ b/src/include/wchar.h
@@ -1,7 +1,7 @@
 #ifndef WCHAR_H
 #define WCHAR_H
 
-FILE_LICENCE ( GPL2_ONLY );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include <stddef.h>
 
diff --git a/src/interface/smbios/smbios_settings.c b/src/interface/smbios/smbios_settings.c
index 83e4320e9..5eadfa081 100644
--- a/src/interface/smbios/smbios_settings.c
+++ b/src/interface/smbios/smbios_settings.c
@@ -15,9 +15,13 @@
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  * 02110-1301, USA.
+ *
+ * You can also choose to distribute this program under the terms of
+ * the Unmodified Binary Distribution Licence (as given in the file
+ * COPYING.UBDL), provided that you have satisfied its requirements.
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include <stdint.h>
 #include <string.h>
diff --git a/src/net/aoe.c b/src/net/aoe.c
index a6d7b3e7b..2da8655b4 100644
--- a/src/net/aoe.c
+++ b/src/net/aoe.c
@@ -15,9 +15,13 @@
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  * 02110-1301, USA.
+ *
+ * You can also choose to distribute this program under the terms of
+ * the Unmodified Binary Distribution Licence (as given in the file
+ * COPYING.UBDL), provided that you have satisfied its requirements.
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include <stddef.h>
 #include <string.h>
diff --git a/src/net/arp.c b/src/net/arp.c
index 261e681e1..663dc0026 100644
--- a/src/net/arp.c
+++ b/src/net/arp.c
@@ -15,9 +15,13 @@
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  * 02110-1301, USA.
+ *
+ * You can also choose to distribute this program under the terms of
+ * the Unmodified Binary Distribution Licence (as given in the file
+ * COPYING.UBDL), provided that you have satisfied its requirements.
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include <stdint.h>
 #include <stdlib.h>
diff --git a/src/net/eth_slow.c b/src/net/eth_slow.c
index db54b55a4..049c26cb3 100644
--- a/src/net/eth_slow.c
+++ b/src/net/eth_slow.c
@@ -15,9 +15,13 @@
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  * 02110-1301, USA.
+ *
+ * You can also choose to distribute this program under the terms of
+ * the Unmodified Binary Distribution Licence (as given in the file
+ * COPYING.UBDL), provided that you have satisfied its requirements.
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include <stdlib.h>
 #include <string.h>
diff --git a/src/net/ethernet.c b/src/net/ethernet.c
index 03978c2a8..1ca92a20f 100644
--- a/src/net/ethernet.c
+++ b/src/net/ethernet.c
@@ -15,9 +15,13 @@
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  * 02110-1301, USA.
+ *
+ * You can also choose to distribute this program under the terms of
+ * the Unmodified Binary Distribution Licence (as given in the file
+ * COPYING.UBDL), provided that you have satisfied its requirements.
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include <stdint.h>
 #include <stdlib.h>
diff --git a/src/net/ipv4.c b/src/net/ipv4.c
index 4dae20d10..85ee5a68b 100644
--- a/src/net/ipv4.c
+++ b/src/net/ipv4.c
@@ -16,6 +16,10 @@
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  * 02110-1301, USA.
+ *
+ * You can also choose to distribute this program under the terms of
+ * the Unmodified Binary Distribution Licence (as given in the file
+ * COPYING.UBDL), provided that you have satisfied its requirements.
  */
 
 #include <string.h>
@@ -44,7 +48,7 @@
  *
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 /* Unique IP datagram identification number (high byte) */
 static uint8_t next_ident_high = 0;
diff --git a/src/net/netdevice.c b/src/net/netdevice.c
index a55e6b7d7..3c4b4cd07 100644
--- a/src/net/netdevice.c
+++ b/src/net/netdevice.c
@@ -15,9 +15,13 @@
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  * 02110-1301, USA.
+ *
+ * You can also choose to distribute this program under the terms of
+ * the Unmodified Binary Distribution Licence (as given in the file
+ * COPYING.UBDL), provided that you have satisfied its requirements.
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include <stdint.h>
 #include <stdlib.h>
diff --git a/src/net/tcp.c b/src/net/tcp.c
index 987cb63e1..719c99360 100644
--- a/src/net/tcp.c
+++ b/src/net/tcp.c
@@ -26,7 +26,7 @@
  *
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 /** A TCP connection */
 struct tcp_connection {
diff --git a/src/net/tcp/httpcore.c b/src/net/tcp/httpcore.c
index 1d1953e61..c20db7044 100644
--- a/src/net/tcp/httpcore.c
+++ b/src/net/tcp/httpcore.c
@@ -15,9 +15,13 @@
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  * 02110-1301, USA.
+ *
+ * You can also choose to distribute this program under the terms of
+ * the Unmodified Binary Distribution Licence (as given in the file
+ * COPYING.UBDL), provided that you have satisfied its requirements.
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 /**
  * @file
diff --git a/src/net/tcpip.c b/src/net/tcpip.c
index 4bcbe64bb..261da5822 100644
--- a/src/net/tcpip.c
+++ b/src/net/tcpip.c
@@ -17,7 +17,7 @@
  * TCP/IP transport-network layer interface
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 /**
  * Process a received TCP/IP packet
diff --git a/src/net/udp.c b/src/net/udp.c
index 76da67ecf..0f7dfb24a 100644
--- a/src/net/udp.c
+++ b/src/net/udp.c
@@ -17,7 +17,7 @@
  * UDP protocol
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 /**
  * A UDP connection
diff --git a/src/net/udp/dhcp.c b/src/net/udp/dhcp.c
index 7a1a7c494..2e75ac815 100644
--- a/src/net/udp/dhcp.c
+++ b/src/net/udp/dhcp.c
@@ -15,9 +15,13 @@
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  * 02110-1301, USA.
+ *
+ * You can also choose to distribute this program under the terms of
+ * the Unmodified Binary Distribution Licence (as given in the file
+ * COPYING.UBDL), provided that you have satisfied its requirements.
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include <string.h>
 #include <stdlib.h>
diff --git a/src/net/udp/dns.c b/src/net/udp/dns.c
index fffe6e697..2d77477f6 100644
--- a/src/net/udp/dns.c
+++ b/src/net/udp/dns.c
@@ -18,9 +18,13 @@
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  * 02110-1301, USA.
+ *
+ * You can also choose to distribute this program under the terms of
+ * the Unmodified Binary Distribution Licence (as given in the file
+ * COPYING.UBDL), provided that you have satisfied its requirements.
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include <stdint.h>
 #include <stdlib.h>
diff --git a/src/net/udp/tftp.c b/src/net/udp/tftp.c
index 375d55e6f..953bcb46a 100644
--- a/src/net/udp/tftp.c
+++ b/src/net/udp/tftp.c
@@ -15,9 +15,13 @@
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  * 02110-1301, USA.
+ *
+ * You can also choose to distribute this program under the terms of
+ * the Unmodified Binary Distribution Licence (as given in the file
+ * COPYING.UBDL), provided that you have satisfied its requirements.
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include <stdint.h>
 #include <stdlib.h>
diff --git a/src/usr/autoboot.c b/src/usr/autoboot.c
index 4bcb64d4c..72b8350cf 100644
--- a/src/usr/autoboot.c
+++ b/src/usr/autoboot.c
@@ -15,9 +15,13 @@
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  * 02110-1301, USA.
+ *
+ * You can also choose to distribute this program under the terms of
+ * the Unmodified Binary Distribution Licence (as given in the file
+ * COPYING.UBDL), provided that you have satisfied its requirements.
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include <string.h>
 #include <stdio.h>
diff --git a/src/usr/pxemenu.c b/src/usr/pxemenu.c
index b69905df1..2d05d3f51 100644
--- a/src/usr/pxemenu.c
+++ b/src/usr/pxemenu.c
@@ -15,9 +15,13 @@
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  * 02110-1301, USA.
+ *
+ * You can also choose to distribute this program under the terms of
+ * the Unmodified Binary Distribution Licence (as given in the file
+ * COPYING.UBDL), provided that you have satisfied its requirements.
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include <stdint.h>
 #include <stdlib.h>