The Apache 2 license is incompatible with the GPLv2 because it protects against patents, while the GPLv2 doesn't (but the GPLv3 does, so the Apache 2 license is compatible with version 3 of the GPL). This is a *good* thing about the Apache 2 license, not a bad thing, and unless you're a Git like Linus Torvalds (excuse the pun), if you use the GPLv2, you'll allow later versions of the GPL, which makes those programs compatible with Apache 2 licensed programs as well.

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