your basic right as a customer is doing anything that the usage agreement of your product allows. You can't buy a CD, for instance, and play it in a show (at least not in most countries, since this can be defined as profiting from that profit, and you didn't buy that right when you bought the CD). You can't also play a DVD in an oil rig, school bus or any other public place (that's on the DVD agreement, right there when you turn it on). And if having your book reproduced as audio offends the 'Book Guild agreement', then you probably can't do it 'legally'. Ouch.

Yes, that's ridiculous - but that's as far as your 'basic rights' go...