"One of the unsung features of GPLv3 is its grant of
compatibility to the Apache and Eclipse open source licenses.
Apache or Eclipse licensed code can now be combined with GPL code
without creating a violation of the GPL. That wasn't possible in
the past, or at least, not sanctioned by the Free Software
"Both the Apache and Eclipse Foundations sponsored business
friendly licenses that allowed open source code created under their
terms to be combined with clearly labeled, proprietary code. Their
open source code, such as the Apache Web Server or the Eclipse
programmers workbench, could and did serve as the foundation for
many new commercial products..."