Originally Posted by Hellmark
How is the invisible watermark any different than a serial number? Your laptop has one, your cellphone, your car, your... well, pretty much everything. The manufacturer or the retailer cannot track your product via the serial number like GPS or anything, and neither can the publishers via the watermark. Nothing phones home. The only thing that happens, is that if the item turns up in the commission of a crime, the authorities can find out who the owner is, be it your gun or your ebook. If there was something reporting back, or anything like that, I'd be against it, but with this, it is something that is entirely passive and pretty much exactly like something already in wide spread use.
serial numbers exists for support reason... not becasue the manufacturer don't trust thier customers.