A federal judge has upheld a previous ruling and stopped RealNetworks from selling its RealDVD DVD-ripping software.

The Motion Picture Association of America had claimed that RealDVD violated the Digital Millennium Copyright Act because it worked around copy controls and has managed to get the product banned.

The argument centres around whether being able to playback the DVD's contents from a PC's hard drive (without the original disc present) is a violation of the content-scramble license requires that the keys to the encryption code must be read from the DVD while it is inside the computer.

US District Judge Marilyn Hall Patel said: "I'm not satisfied that in fact this technology is not in violation of the DMCA".

RealNetworks attorney James DiBoise said consumers had a "fair use right" to copy DVDs for personal use.