For additional information about Open Content, Open Access and Free Content in a legal context, some literature suggestions and links are provided below.
Links
[1] https://www.ifross.org/?q=iii-publikationen
[2] http://www.gerd-hansen.net/Hansen_GRUR_Int_2005_378ff.pdf
[3] http://www.ifross.de/ifross_html/art31.html
[4] http://www.altlawforum.org/intellectual-property/publications/articles-on-copyright-and-culture/opencontent.pdf/view
[5] http://lists.ibiblio.org/pipermail/cc-de/2004-July/000015.html
[6] http://www.opensourcejahrbuch.de/2006/abstracts/kapitel_06/osjb2006-06-01-moeller.html
[7] http://www.lehrstuhl-spindler.uni-goettingen.de/extern/openaccess/leitfaden/
[8] https://www.ifross.org/?q=en/category/tags/open-content-license