Open Content License
The Open Content License is a share-alike public copyright license which can be applied to a work to make it open content. This license is not compatible with most other license (beside permissive licenses) in that it requires derivative works to be licensed under the Open Content License (Viral license). With the exception of media and handling costs, it forbids charging for copies of a licensed work, but does not otherwise forbid commercial use.
The Open Content License, dated July 14, 1998, predates the GNU Free Documentation License (GFDL) and other non-software public licenses, though discussions were held between David A. Wiley, creator of the Open Content License, and Richard Stallman, leader of the Free Software Foundation, who created the GNU General Public License for software and would create the GFDL. The license text is titled "OpenContent License (OPL)". "OPL" stood for OpenContent Principles and License. Another license released a year later, also by the Open Content Project is called the Open Publication License.
- OpenContent License (OPL)
- Grossman, Lev (1998-07-18). "New Free License to Cover Content Online". Netly News. Archived from the original on 2000-06-19. Retrieved 2010-12-27.
- "OpenContent License (OPL)". Archived from the original on 2000-06-19.
- Updating the OpenContent License and Clarifying a Few Things