The Free Software Foundation
considers
the Apache License, Version 2.0
to be a free software
license, compatible with version 3 of the GPL.
Despite our best efforts, the FSF has never considered the Apache
License to be compatible with GPL version 2, citing the patent
termination and indemnification provisions as restrictions not present
in the older GPL license. The Apache Software Foundation believes
that you should always try to obey the constraints expressed by the
copyright holder when redistributing their work.
The Apache Software Foundation is a nonprofit organization
that is dedicated to open source software development.
We never knowingly incorporate patented technology in our own products
unless such technology has been offered free for everyone.
Please note that this discussion only benefits third parties that
produce GPL-covered products. The Apache Software Foundation does not
allow its own projects to distribute software under licenses more
restrictive than the Apache License, and the Free Software Foundation
does not distribute software under the Apache License.
The ASF will not dual-license our software because such licenses
make it impossible to determine the conditions under which we have
agreed to collaborate on a collective product, and are thus contrary to
the Apache spirit of open, collaborative development among individuals,
industry, and nonprofit organizations.