Since licensing has come up a few times in this thread: I've been hearing recently that the Mozilla Public licence (or the EU Public licence) is a good middle g

Since licensing has come up a few times in this thread: I've been hearing recently that the Mozilla Public licence (or the EU Public licence) is a good middle ground between the "viral" GPL and the "do whatever" MIT - as per my understanding, if your code is MPL or EUPL, it can still be incorporated as part of software that has a different licence, but any direct changes to the MPL/EUPL licensed code itself has to be shared openly. Does anyone here have experience with them, or knowledge about whether that description is more or less correct?