doubleTwist, a company co-founded by hacker Jon Lech Johansen (a.k.a 'DVD Jon'), has launched doubleTwist desktop - software that allows digital media files to be shared across devices.

Users simply select digital image, audio and video files they want to share with friends and the software automatically converts the files into a suitable format and uploads them to the web while also notifying the recipient.

This will benefit users of Apple's iTunes store. Currently songs bought on iTunes can only be stored on an iPod. Users wishing to copy the files to other portable music devices must first burn the songs to a CD and then copy the disc back on to the computer - but the quality of the music is sacrificed.

According to doubleTwist one hundred songs can be converted in about half an hour, with a slight degradation in sound quality, according to the firm.

"The digital media landscape has become a tower of Babel, alienating and frustrating consumers. Our goal is to provide a simple and well integrated solution that the average consumer can use to eliminate the headaches associated with their expanding digital universe," said Monique Farantzos, co-founder of doubleTwist.

The software is being backed by Geneva-based Index Ventures, which also championed Skype and before they were acquired by bigger organisations.

According to doubleTwist, the software is legal.

"Users can only play back the music they have already purchased and they are authorised to play. All we are facilitating are friends sending things to one another," Farantzos told Reuters.

The software can be download for free.