Would it be prudent if adobe hid a bit of code that will go back to the main server as long the computer is connected to internet? from what i see, they just need to get the major firewall makers like Microsoft, Norton and the rest to agree and that piece of code will get by as easy as water through a net.
and then they go one more step by adding another box in exif to show that PS created the file and whether the PS is genuine software. I do think there are some stock companies that are particular the exif data be intact.
even if a crack and keygen is used to fool the software into activating, that piece of code if go back to mainframe and double check the authenticity could mean very big and expensive trouble.