Professor Lawrence Lessig is is quoted in Ars Technica about a decision in a copyright infringement case:

The lower court had found that redistributing software in violation of the terms of a free software license could constitute a breach of contract, but was not copyright infringement.

Larry Lessig, who founded both Creative Commons and Stanford's Center for Internet and Society, called the decision "huge and important." His reaction is likely to be shared by other advocates of free software, who have long worried about the enforceability of copyleft licenses.