Definitely don't want to mess with the Adobe legal team. If you are need a photoshop activation key, you probably don't know how to use photoshop. Eventually you are going to have to spend some money somehwere to learn to a lot of time investment to learn. Its better to just commission a graphic designer for your photoshop needs or try out GIMP.
I was recently contacted by a US attorney because I apparently bought a copy that was obtained illegally. I would stay away from trying to rip them off.
I would reccomend you to check ebay for older versions and to get one about PS 7. This will work out perfect if you are just getting started and you can still get a newer version afterwards.