The Free Software Foundation Europe is the facilitator of a legal network comprising hundreds of experts from private practice, corporations, universities around the world. One of the Special interest groups has spent almost one year producing a document explaining how differently licensed software programs and libraries can and cannot mixed to make or not to make a derivative of each other.
The result is what we call "the linking document". It might not be perfect, but it's a valid platform for discussion around a topic that provide headache to many players in the field. To find a comparable discussion, albeit controversial and limited to the GNU licenses, one should redress to the FSF's FAQ.
Some clarity at last.
FSUG Italia and Debian-it 