[mikegerwitz]

I was skeptical of this as well; I had the FSF licensing team confirm that the WTFPL is a free software license a month or two ago. You can see it here:

https://gnu.org/licenses/license-list.html#WTFPL

From Joshua Gay:

> Our interpretation of this license is that it is > intended to allow you to do whatever you want with the > work. Therefore, we assume that this includes using, > copying, modifying, and distributing modifications for any > purpose.

He was, however, cautious to say "I can not conjecture how a court would interpret that phrase" and recommended to consult a lawyer.

[rakoo]

It's a sad world we live in if the rights you give for a software work are opt-in (you may do this and that) and not opt-out (you may not do this and that)