I'm definitely not a lawyer, just a geek and a critic of the USPTO. I'm definitely a little scared that they seem to be allowing overly broad patents to encompass ideas that are clearly and rightfully in the public domain. Tivo seems to have a patent that encompasses any form of recording tv, although that ought to be clearly wrong. If there are meaningful limits to Tivo's patent It would take someone much better versed than myself (maybe someone who can find the markman hearings) to find it. I'll still say the 510 is just a VCR with a satellite tuner and a hard drive though.