License Compatibility for Derivative Works
If there is one issue that causes the most confusion and angst in the open source licensing community it is this: How do open source licenses interact with each other when derivative works are created from multiple contributions?
For example, a GPL-licensed contribution may be offered for an Apache-licensed derivative work. Or an OSL-licensed contribution may be offered for a GPL-licensed derivative work. What license terms apply to the resulting derivative work? Can the contribution even be accepted, consistent with the terms of both the contribution and derivative works licenses?
I discussed in the previous section the simpler problem of incorporating a contribution into a collective work; that is ...
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