Release under license?

[Lemures]

I will be releasing a program soon, written in autoit, that will be used by a few hundred people. I would like to release it in such a manner that I can be sure that nobody will take it and sell it. How do I do this? I've seen several programs released under the GNU GPL, but even after reading the FAQ regarding that, I'm not entirely certain what it is or what it means. can anybody give me an explanation of what I should do, or where I should look for more information?

[Alcoholic]

Search in wikipedia for "software license agreement".

If u want a free and legal solution then GNU General Public License is waiting for u...