For people interested in the legalities of licenses, it's released under the Apache License 2.0 which is a "free software" opensource license that is compatible when combined with GPL3, but not with GPL 1 or 2.
the Apache 2.0 license includes not just copyright but patent licensing, so the software will contain no hidden patent restrictions for patents owned by the creators and contributors.
the Apache 2.0 license includes not just copyright but patent licensing, so the software will contain no hidden patent restrictions for patents owned by the creators and contributors.