Quote:
Originally Posted by perversity
I like the B&N's idea of tying each file to a credit card number. You can loan it out to whomever you want, but you could only GIVE it to people whom you would trust with your current credit card # which lessons the potential list exponentially.
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Firstly, it's a one-way hash, you can't get the credit card number back out. Second, given the existance of such things as stolen, one-use and pre-loaded credit cards, it's pretty useless as a measure in any case even if you could.
HansTWM - Sure, except you have to restrict access to programs which won't strip the watermark, so either there has to be an open SDK for that (with the potential abuse, although you could try tying it to an auth server...) or lock down the format, hard. Otherwise, the moment someone wants smaller margins...