The author of JSLint wrote:
"So I added one more line to my license, was that, “the Software shall be used for Good, not Evil.” And thought: I’ve done my job!
/…/
Also about once a year, I get a letter from a lawyer, every year a different lawyer, at a company. I don’t want to embarrass the company by saying their name, so I’ll just say their initials, “IBM,” saying that they want to use something that I wrote, 'cause I put this on everything I write now. They want to use something that I wrote and something that they wrote and they’re pretty sure they weren’t gonna use it for evil, but they couldn’t say for sure about their customers. So, could I give them a special license for that?
So, of course!
So I wrote back—this happened literally two weeks ago—I said, “I give permission to IBM, its customers, partners, and minions, to use JSLint for evil.” "