The funny thing is, I don't think there have been any legal battles. Tab sites have been closing down before it gets to that point out of fear. No tab sites have stood up to them yet. Back Track sites on the other hand have gotten Cease and Desist Orders for BTs that that were note for note from cds. At this point it is still unclear what is or is not legal. There is a lengthy closed thread, I started, some time ago here that has some good info added by members.
Should sites like this be shut down?
There has still been no definitive legal decision on this subject.