Yep, as Liz points out, although the frameworks are free software, open-source in a general sense, the license is definitely not
OSI approved and there are a few places where it goes against the
OSI "open-source definition". The main reason for that, I'm pretty sure, is simply that the Omni source releases predate those things (just barely); it looks like we haven't even modified the source license since 1998, a little while after the OSI came into existence.
Anyway, if you have a specific concern or problem with the source license that's keeping you from doing something you want to do, please contact us. (Disclaimer: I'm not a lawyer either.)