From HacDC Wiki
Point four of our Mission Statement says HacDC will freely share its research and discoveries, using what is learned to teach others.
In general, our licensing policy guarantees this mission point as well as ensuring that HacDC remains compliant with the spirit and letter of the law for 501(c)(3) exempt non-profit organizations.
Website, Blog and Other Creations
All contributions and content produced by HacDC (except for our Wiki) are licensed under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 United States License
Because of the special nature of the content available on the HacDC Wiki, all contributions to it are considered to be released under the GNU Free Documentation License 1.2:
The purpose of this License is to make a manual, textbook, or other functional and useful document "free" in the sense of freedom: to assure everyone the effective freedom to copy and redistribute it, with or without modifying it, either commercially or noncommercially. Secondarily, this License preserves for the author and publisher a way to get credit for their work, while not being considered responsible for modifications made by others. This License is a kind of "copyleft", which means that derivative works of the document must themselves be free in the same sense. It complements the GNU General Public License, which is a copyleft license designed for free software.