GPL License prevents import in non-GPL license application or library

[Philippe GOETZ]

The GPL v2 license prevents to import of this library in non-GPL application or "derived" library, e.g. gittle (https://github.com/FriendCode/gittle) (Apache 2.0).

See http://www.apache.org/licenses/GPL-compatibility.html

See also http://stackoverflow.com/questions/6748333/import-a-library-that-imports-a-gpl-library.

It would be better to use LGPL or a GPL with "import exception" (similar to classpath exception used by OpenJDK).

See also http://en.wikipedia.org/wiki/GPL_linking_exception

Even better use Apache 2.0 or BSD like.

[Jelmer Vernooij (jelmer)]

Dulwich is under the GPL version 2 *or later*. You can use it under the terms of the GPLv3, which is compatible with the Apache v2 license.

I did look into changing the license of Dulwich to the Apachev2 license a while ago, but this effort has stalled because I haven't heard back from all contributors yet. See https://lists.launchpad.net/dulwich-users/msg00758.html