If I'm reading this right, and I'd need more information on the references used to make the judgments, then a MIT License with a definitive statement on patents (positive or negative) would be a fantastic copyleft license that is:
* Easy for nonlegally minded people to read
* Legally obvious with little room for interpretation
* Easy for nonlegally minded people to read
* Legally obvious with little room for interpretation
* Easy to be incorporated into larger projects