ASLv2 is compatible with GPLv3 (works under ASLv2 can be inorporated into GPLv3), but not vice versa. This is because GPL has (arguably useful) restrictions whi

ASLv2 is compatible with GPLv3 (works under ASLv2 can be inorporated into GPLv3), but not vice versa. This is because GPL has (arguably useful) restrictions which ASL does not. A common goal of ASLv2 and GPLv3 is the restriction on patents, which makes them both incompatible with GPLv2. This is an important difference which makes GPLv3 a superior freedom-preserving license to v2, and the resulting incompatibility is not a matter of interpretation - you can't downgrade licenses. It is unfortunate that Linux was not licensed as GPLv2 or later which is, alongside Linus' support for TiVoization(DrM) and the corporate lawyers' spreading of FUD, the reason why we're still forced to discuss GPLv2.