IBM didn't develop Unix, AT&T did, originally. Not sure why you think IBM would have a dog in that fight. There is IBM tech in the kernel; IBM put it there.
The whole "Linux infringes Unix patents" was already litigated in the SCO case. SCO got their clock cleaned in that one. It's a non-starter.
LOL. You obviously know little about these things.
The whole "Linux infringes Unix patents" was already litigated in the SCO case.
Again, you're completely wrong. SCO didn't have any (or very many) UNIX patents. IBM did, check that article I posted. They chose not to enforce them, because it helped them destroy their American competitors, and open doors to new foreign customers.