Check out this interesting clause in the JSLint software license. (From wikipedia)
The JSLint license is a derivative of the MIT License. The sole modification is the addition of “The Software shall be used for Good, not Evil.” This clause has prevented JSLint-related software from being hosted on Google Code and from being included in the Debian free software package repositories.
Interesting that such an innocuous modification to the license could have such dire consequences. I wish the author would drop the clause, since it likely does not decrease “evil” but makes using JSLint more difficult.