James is ok with licensing his code GPLv2 or later rather than GPLv2-only.

dulwich/__init__.py

@@ -4,7 +4,8 @@
 # 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; version 2
-# of the License.
+# of the License or (at your option) any later version of 
+# the License.
 # 
 # This program is distributed in the hope that it will be useful,
 # but WITHOUT ANY WARRANTY; without even the implied warranty of

dulwich/commit.py

@@ -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
-# or (at your option) a later version of the License.
+# or (at your option) any later version of the License.
 # 
 # This program is distributed in the hope that it will be useful,
 # but WITHOUT ANY WARRANTY; without even the implied warranty of

dulwich/errors.py

@@ -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; version 2
-# of the License.
+# or (at your option) any later version of the License.
 # 
 # This program is distributed in the hope that it will be useful,
 # but WITHOUT ANY WARRANTY; without even the implied warranty of

dulwich/repo.py

@@ -5,7 +5,8 @@
 # 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; version 2
-# of the License.
+# of the License or (at your option) any later version of 
+# the License.
 # 
 # This program is distributed in the hope that it will be useful,
 # but WITHOUT ANY WARRANTY; without even the implied warranty of

dulwich/tests/__init__.py

@@ -4,7 +4,8 @@
 # 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; version 2
-# of the License.
+# of the License or (at your option) any later version of 
+# the License.
 # 
 # This program is distributed in the hope that it will be useful,
 # but WITHOUT ANY WARRANTY; without even the implied warranty of

dulwich/tests/test_objects.py

@@ -4,7 +4,8 @@
 # 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; version 2
-# of the License.
+# of the License or (at your option) any later version of 
+# the License.
 # 
 # This program is distributed in the hope that it will be useful,
 # but WITHOUT ANY WARRANTY; without even the implied warranty of

dulwich/tests/test_repository.py

@@ -4,7 +4,8 @@
 # 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; version 2
-# of the License.
+# of the License or (at your option) any later version of 
+# the License.
 # 
 # This program is distributed in the hope that it will be useful,
 # but WITHOUT ANY WARRANTY; without even the implied warranty of