^^ Photoshop is a bit more complicated, but if you learn it, it will show that you really want to learn how to create effective creations.
Also, I could be wrong, I think the only way you would get caught by the authority for illegal purposes is if you contact Adobe.com themselves. For example, requesting online-support.
On rare occasions, when I open photoshop, a window would pop up asking me for my information to register to adobe, but i decline/'ask me later', and continue on with making signatures.