Actually, these serials are legit and they seem to work. It WAS earlier only for existing users, but I read somewhere later that adobe changed that. That's why you don't even need to sign in to download these (usually you are required to sign in)
>It has not. Instead, Adobe has made CS2 even easier to get, by removing the Adobe ID requirement. The company created a new CS2 download page, and this time around, it had no registration requirement at all.