Re: Please drop your license. You have 20 lawsuits to comply.
If there is a SHRED of doubt about a license being compatible then the only 100% safe choice is to not use it. If someone has worded things to be unclear then they have probably deliberately done-so, especially if said lack of clarity would benefit them while screwing you.
Sometimes I wonder how I got to be such a cynic...oh yes! It was by way of observing the greedy-underhanded actions of my fellow men.