Free As In Beer
CapsLockBeGone is basically free as in beer. You can use it to your hearts content, though you'll probably only use it once and forget about it for the rest of your life as you blissfully go on using your computer without having to worry that THIS HAPPENS TO YOU AS YOU TYPE.
The license that governs CapsLockBeGone is from Creative Commons. Strictly Speaking, it is the:
Creative Commons Attribution-No Derivative Works 3.0 License
You can click on over there to read all about it. In non-legally binding, laymans terms, it means you can use CapsLockBeGone for free, you can distribute the binary as you like, but you can't alter it in any way and you always need to give credit back to this site.
In other words, use it and be cool about it.
And if you do use it, feel free to make a generous donation to the cause via the PayPal link over to the left there.