[rossy]

The patent restrictions make Apache 2.0 less permissive (even if you think they're a good thing.) They cause practical problems, even for well-meaning free software developers, because they make the licence incompatible with GPLv2.0, which means, if you use an Apache 2.0 library in your program, you can never use any GPLv2.0 licensed libraries or vice versa.

[Fice]

But Apache 2.0 is compatible with GPLv3, which means, that you can combine GPLv3 and "GPLv2 or later" libraries with code under Apache 2.0.