most tabs are not completely acurate anyways, usually just the chord progressions maybe a halfway acurate melody if your lucky. I don't see how they can sue over one persons impression of a song. whats next? sueing cover bands? sueing me for figuring out songs by ear? I can kinda see if someone buys a tab book and copies it down and posts it on the internet... but most of whats out there is just notes from people who figured out something that sounds close by ear.