A Silicon Valley company unveiled Tuesday a new technology that it claims will block 97 percent of the DVD-copying software used by Internet pirates, without interfering with a DVD's playability or picture quality.
Macrovision Corp. said its RipGuard system, which can be included in personal computers, DVD players and DVD recorders, would plug the digital hole through which unauthorized versions of DVD films can be easily copied on a computer and then burned to other discs or put online for downloading.