Add configure option to upgrade (L)GPL to version 3.

Originally committed as revision 19116 to svn://svn.ffmpeg.org/ffmpeg/trunk

COPYING.LGPLv3

+                   GNU LESSER GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+
+  This version of the GNU Lesser General Public License incorporates
+the terms and conditions of version 3 of the GNU General Public
+License, supplemented by the additional permissions listed below.
+
+  0. Additional Definitions.
+
+  As used herein, "this License" refers to version 3 of the GNU Lesser
+General Public License, and the "GNU GPL" refers to version 3 of the GNU
+General Public License.
+
+  "The Library" refers to a covered work governed by this License,
+other than an Application or a Combined Work as defined below.
+
+  An "Application" is any work that makes use of an interface provided
+by the Library, but which is not otherwise based on the Library.
+Defining a subclass of a class defined by the Library is deemed a mode
+of using an interface provided by the Library.
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+object code and/or source code for the Application, including any data
+and utility programs needed for reproducing the Combined Work from the
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+
+  1. Exception to Section 3 of the GNU GPL.
+
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+without being bound by section 3 of the GNU GPL.
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+  If you modify a copy of the Library, and, in your modifications, a
+facility refers to a function or data to be supplied by an Application
+that uses the facility (other than as an argument passed when the
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+version:
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+   function or data, the facility still operates, and performs
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+   b) under the GNU GPL, with none of the additional permissions of
+   this License applicable to that copy.
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+   Library is used in it and that the Library and its use are
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+   document.
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+the following:
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+   the Library is used in it and that the Library and its use are
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+   Application with a modified version of the Linked Version. (If
+   you use option 4d0, the Installation Information must accompany
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+   Information in the manner specified by section 6 of the GNU GPL
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+choice, if you do both of the following:
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+   on the Library, uncombined with any other library facilities,
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+differ in detail to address new problems or concerns.
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+received it does not specify a version number of the GNU Lesser
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+Library.

LICENSE

@@ -26,6 +26,11 @@ There are a handful of files under other licensing terms, namely:
 * The files libavcodec/jfdctfst.c, libavcodec/jfdctint.c, libavcodec/jrevdct.c
   are taken from libjpeg, see the top of the files for licensing details.
 
+Should you, for whatever reason, prefer to use version 3 of the (L)GPL, then
+the configure parameter --enable-version3 will activate this licensing option
+for you. Read the file COPYING.LGPLv3 or, if you have enabled GPL parts,
+COPYING.GPLv3 to learn the exact legal terms that apply in this case.
+
 
 external libraries:
 -------------------

cmdutils.c

@@ -312,6 +312,20 @@ void show_license(void)
     "This version of %s has nonfree parts compiled in.\n"
     "Therefore it is not legally redistributable.\n",
     program_name
+#elif CONFIG_GPLV3
+    "%s is free software; you can redistribute it and/or modify\n"
+    "it under the terms of the GNU General Public License as published by\n"
+    "the Free Software Foundation; either version 3 of the License, or\n"
+    "(at your option) any later version.\n"
+    "\n"
+    "%s is distributed in the hope that it will be useful,\n"
+    "but WITHOUT ANY WARRANTY; without even the implied warranty of\n"
+    "MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n"
+    "GNU General Public License for more details.\n"
+    "\n"
+    "You should have received a copy of the GNU General Public License\n"
+    "along with %s.  If not, see <http://www.gnu.org/licenses/>.\n",
+    program_name, program_name, program_name
 #elif CONFIG_GPL
     "%s is free software; you can redistribute it and/or modify\n"
     "it under the terms of the GNU General Public License as published by\n"
@@ -327,6 +341,20 @@ void show_license(void)
     "along with %s; if not, write to the Free Software\n"
     "Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA\n",
     program_name, program_name, program_name
+#elif CONFIG_LGPLV3
+    "%s is free software; you can redistribute it and/or modify\n"
+    "it under the terms of the GNU Lesser General Public License as published by\n"
+    "the Free Software Foundation; either version 3 of the License, or\n"
+    "(at your option) any later version.\n"
+    "\n"
+    "%s is distributed in the hope that it will be useful,\n"
+    "but WITHOUT ANY WARRANTY; without even the implied warranty of\n"
+    "MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n"
+    "GNU Lesser General Public License for more details.\n"
+    "\n"
+    "You should have received a copy of the GNU Lesser General Public License\n"
+    "along with %s.  If not, see <http://www.gnu.org/licenses/>.\n",
+    program_name, program_name, program_name
 #else
     "%s is free software; you can redistribute it and/or\n"
     "modify it under the terms of the GNU Lesser General Public\n"

configure

@@ -75,6 +75,7 @@ show_help(){
   echo "  --enable-shared          build shared libraries [no]"
   echo "  --enable-gpl             allow use of GPL code, the resulting libs"
   echo "                           and binaries will be under GPL [no]"
+  echo "  --enable-version3        upgrade (L)GPL to version 3 [no]"
   echo "  --enable-nonfree         allow use of nonfree code, the resulting libs"
   echo "                           and binaries will be unredistributable [no]"
   echo "  --disable-ffmpeg         disable ffmpeg build"
@@ -812,6 +813,7 @@ CONFIG_LIST="
     small
     static
     swscale_alpha
+    version3
     x11grab
     zlib
 "
@@ -933,6 +935,8 @@ HAVE_LIST="
 
 # options emitted with CONFIG_ prefix but not available on command line
 CONFIG_EXTRA="
+    gplv3
+    lgplv3
 "
 
 CMDLINE_SELECT="
@@ -1757,6 +1761,7 @@ die_license_disabled nonfree libamr_nb
 die_license_disabled nonfree libamr_wb
 die_license_disabled nonfree libfaac
 
+enabled version3 && { enabled gpl && enable gplv3 || enable lgplv3; }
 
 check_deps $ARCH_EXT_LIST
 
@@ -2391,6 +2396,10 @@ done
 license="LGPL version 2.1 or later"
 if enabled nonfree; then
     license="nonfree and unredistributable"
+elif enabled gplv3; then
+    license="GPL version 3 or later"
+elif enabled lgplv3; then
+    license="LGPL version 3 or later"
 elif enabled gpl; then
     license="GPL version 2 or later"
 fi