The principles of open source have been adapted for many other forms of user generated content. Supporters of the open content movement advocate some restrictions of use, requirements to share changes, and attribution to other authors of the work.
This “culture” or ideology takes the view that the principles apply more generally to facilitate concurrent input of different agendas, approaches and priorities, in contrast with more centralized models of development such as those typically used in commercial companies.[6]
Advocates of the open source principles often point to Wikipedia as an example, but Wikipedia has in fact often restricted certain types of use or user, and the GFDL license it uses makes specific requirements of all users that technically violate the open source principles. -Source