A few years ago, I bought PS CS3 from an eBay seller who had 100% positive feedback. When I got the software, it looked legit, beautiful packaging complete with a hologram seal. I installed it and it did not offer to go to Adobe for registration. It turns out it was a (good) counterfeit. It was a hassle to prove it was a counterfeit, I had to send the software to Adobe's software piracy division and get a statement from them. I eventually got my money back and the seller was booted off from eBay. In the mean time, hundreds of other purchasers were duped. Who knows what other bad things could be on a pirated disc?