Yes, as all my other libraries, this one is licensed under Apache 2. It is as free as you can get, with the only requirement that if you actually do modifications to the library itself, you have to give credit to the original authors.
It only seems fair to me, but in any case it is the standard license accepted for open source contributions where I work. I encourage everyone to use the library freely without legal worries, as Apache 2 is one of the most permissive licenses out there
