Slysoft says the new version of its AnyDVD programme allows users to make "backup security copies" of high definition movies.

The claim is a blow to Sony which developed the Blu-ray format.

The discs are protected by an anti-piracy system called BD+.

When it launched in 2007, developers boasted it would not be cracked for 10 years.

SlySoft says it hacked the BD+ technology in November.

It decided to wait for the result of the "format war" between Blu-ray and HD DVD before releasing a full product.

BD+ is designed to react to attempts on its technology.

Its developers say they can re-lock copied discs, making them unusable in the future.

SlySoft reckons it is prepared for this.