Feeds

Hollywood tunes into anti-piracy audio signals

HD DVDs with movie-stamped watermarks

Pirate DVDs made by copying movies in cinemas could become a thing of the past in the HD era, if technology presented to the DVD Forum proves successful.

The system requires film distributors to embed an inaudible watermark in film soundtracks. HD DVD players will contain a sensor that listens out for the watermark in the soundtracks of any disc being played.

Since official HD DVDs will not contain the watermark, its presence on the disc reveals the disc to be a pirate copy.

Playback will then be aborted, and the buyer's name and address beamed to the nearest law enforcement agency. Just joking.

The watermark comprises digital data encoded in subtle shifts in the audio waveform that makes up the soundtrack, New Scientist reports this week. Human ears can't detect the fluctuations.

Whether the pirates digitise a movie print directly, or simply point a camcorder at the cinema screen, they will still capture the audio and the watermark with it.

Legitimate DVDs will also contain a different watermark, Hollywood hopes, which can be used to look for content ripped from official discs, but that's going to be harder to square with established 'fair use' copying provisions in certain territories.

If the technique wins the approval of the DVD Forum, the presence of the watermark detector could be mandated in any player stamped with the official HD DVD brand. Of course, there will be plenty of machines out there whose manufacturers use the HD DVD logo without permission, or don't use it at all, and in either case may ship machines without the sensor.

However, Hollywood presumably believes it would nonetheless create a major disincentive for most consumers to buy pirate HD DVDs. Buy one that turns out not to work, and users may go on to buy a second disc. But they won't buy a third, the argument runs.

It is not clear at this stage whether the rival Blu-ray Disc format will adopt the technique. The system was detailed this week by a Warner Bros representative. Now that Warner is backing both BD and HD DVD, there's a good chance BD will incorporate the system. ®

Whitepapers

Why cloud backup?
Combining the latest advancements in disk-based backup with secure, integrated, cloud technologies offer organizations fast and assured recovery of their critical enterprise data.
Getting started with customer-focused identity management
Learn why identity is a fundamental requirement to digital growth, and how without it there is no way to identify and engage customers in a meaningful way.
10 threats to successful enterprise endpoint backup
10 threats to a successful backup including issues with BYOD, slow backups and ineffective security.
High Performance for All
While HPC is not new, it has traditionally been seen as a specialist area – is it now geared up to meet more mainstream requirements?
Beginner's guide to SSL certificates
De-mystify the technology involved and give you the information you need to make the best decision when considering your online security options.