robust cryptography

[Mark R]

1000 year dvd and soon blu ray

http://www.digitalartsonline.co.uk/news/creative-hardware/m-blu-ray-disc-offers-lifetime-of-storage/

FWIW, the default BD-R disc formulation is very similar to the M-disc formulation, which is why M-disc BD_R discs will be fully compatible with Blu-ray drives.

The special M-disc DVD formulation is not compatible with regular DVD writers and some readers without an enabling firmware update.

What's interesting is that market pressures are forcing BD-R disc producers the other way. They are reformulating BD-R discs to use the older DVD formulation (but this will require firmware updates for readers and writers). The old DVD style formula is much, much cheaper than the inorganic formulation used in BD-R/M-disc type discs.

 

[colonelciller]

This technology is well established in image and audio watermarking technology.

Photoshop has had the ability to embed encrypted copyright data into the pixel data for nearly 20 years (digimark). This copyright message can survive cropping, scaling, editing, image compression and even rotation. It is also (near) invisible to the human eye.

Similar tech is used in audio to identify movie soundtracks. (cinavia). Mediastreamer boxes and bluray players include detection for this encrypted copyright message. If the media being played is not a pressed, encrypted disc, then the player will abort playback. This message is so persistent that a home movie e. g. a kids party with a tv in the background showing an marked movie, will be unplayable on a compliant media player.

the embedding of watermarks into the pixels of an image is useful to catch unsophosticated businesses and bloggers and automated tools that use an image on the web, but the watermark is absurdely fragile and the application of a few photoshop filters will quickly destroy the watermark without visually altering the image.

companies make money fooling people into paying for the "robust" service though.