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From GPLv3 Wiki

GPLv3-compatible licenses

The following things should be clarified:

• Affero GPL 1.0 is not compatible with GPLv3-draft-2. In [1], RMS said: "The idea is to make GPL version three compatible with a modified version of the Affero licence. They will modify the Affero licence and thus cause all these things to be compatible."
• PHP license 3.01 requires, that derived works don't contain "PHP" in their name. This contradicts with the last paragraph of section 7.b of GPLv3-draft-2, and makes PHP license 3.01 incompatible with GPLv3-draft-2.
• GPLv2 is not compatible with GPLv3. You can use GPLv2 code in GPLv3 work only if the work is dual-licensed "GPLv2 or any later version", or if you are the copyright holder of the work.

--Larhzu 07:15, 6 October 2006 (EDT)