"Yes I do," Glaser said, arguing that the target audience for the RealDVD products was law-abiding. "It's not trying to convince 15-year-olds not to experiment."

Glaser argued that scofflaws are unlikely to use RealDVD, which costs US$30 and comes with copy protection mechanisms that make it difficult to disseminate any copies of a DVD. There are "dozens of products" that DVD pirates could use if they wanted to make illegal copies, Glaser said. "All you have to do is Google DVD ripper."

Computer users have been able to make unrestricted copies of DVDs since late 1990s when Norwegian hackers cracked the Content-Scrambling System (CSS) devised by the music industry to copy-protect DVDs and released their DeCSS software on the Internet.

Real was sued by Disney, Paramount, Sony, Twentieth Century Fox, NBC Universal, Warner Brothers, Viacom on Sept. 30, 2008. It filed countersuit the same day. The DVD Copy Control Association, which licenses the CSS system, is also involved in the case.

Motion picture attorneys spent much of the day Tuesday questioning their expert witness Robert Schumann and arguing that RealNetworks had deliberately circumvented copy protection mechanisms, in particular the ARccOS (Advanced Regional Copy Control Operating Solution) and RipGuard technologies used by some studios, in order to build RealDVD.