copyrights exits everywhere, yerss....it's wether or not anyone gives a damn about them in certain ...realms (😄) of the world.
and about paint...yes..it is technically possible to create a sig in it, but considering it is the lowest graphic editing software, we can consider that you can make a sig in ANY software that has the option of editing a graphic image 🙂
so...paint fails to no more than..default
In addtion to Raz's previous comment here is the direct link to KMC's official signature request thread:
http://www.killermovies.com/forums/showthread.php?s=&threadid=18944&highlight=signature+requests
Hope that helps, there are a number of very talented signature creators within the site each with a unique style of signature creations.