Just in case you aren’t keeping a copy of the Citizen’s Guide to Esoteric Licensing on your nightstand, JSON is basically an extension of the popular MIT license—do what you want, as long as you don’t limit others from doing the same— with one additional stipulation:
The Software shall be used for Good, not Evil.
Sure, this restriction earned the license a “non-free” designation from the Free Software Foundation, but it’s an important distinction.
This software is free for all. At least, as long as they’re working for the light side.