The latest high-profile copyright infringement case, against Grooveshark, centers on some unusual and controversial evidence: a pair of anonymous blog comments.

Grooveshark allows users to upload songs for others to stream free of charge. The company claims that its actions are legal under the “safe harbor” provisions of the federal Digital Millennium Copyright Act, which protect Web sites that host third-party content.

The Universal Music Group, however, has accused Grooveshark executives of personally uploading unauthorized content, which is not protected under the Act.

As evidence, the suit included a post from Digital Music News, an industry blog, on which anonymous commenters claiming to be Grooveshark employees detailed a culture of open defiance of copyright.

Source: The New York Times