Free content
Free content, or free information, is any kind of work, artwork, or other creative content which does not have lots of legal restrictions about how people can use it.  People have freedom to make changed versions of the content, give changed and not changed versions of the content to others, and sell copies of the content and changed versions of it.  The author of free content does not use all of his copyright monopoly, he gives many of the rights to others.  The articles in Wikipedia are free content.