An Israeli hacker claims to have broken the copyright protection on Amazon’s Kindle e-reader, reports say.
The hack will allow the ebooks stored on the reader to be transferred as pdf files to any other device.
The hacker, known as Labba, responded to a challenge posted on Israeli hacking forum, hacking.org.
It is the latest in a series of Digital Rights Management hacks, the most famous being the reverse engineering of iTunes.
The Kindle e-book reader has been very successful since it was launched in the US in 2007.
Amazon hopes to have sold a million devices by the end of the year.
It leaves it to individual publishers whether they want to apply DRM but books in its main proprietary format .azw, cannot be transferred to other devices.
It did not immediately respond to the news but it is likely it will attempt to patch its DRM software.