How close do copies have to be to be done for infringement? The Satellites and Columbuseses of my youth all looked like the Gibsons (and Fenders) that they copied, at least until you turned the Gibson copies upside down and saw the neck plates. Did Gibson leave them free to flourish as they would whet the appetite for the Real Thing Authentic? I can't see that millimetre-perfect copies are the only ones that infringe trademark, as R*ck*nb*ck*r go after everything that resembles one of their models.