http://pastoxeodebw6dc5bq7kmuxheunuf54xcovzjwhg4cuh6a3rzj6mthqd.onion/about/license
There are many ways you could offer source, and different
solutions will be better for different programs; see section 13 for the
specific requirements. You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.