RE: Cryptography Research wants piracy speed bump on HD DVDs

2005-01-05 Thread Marcel Popescu
From: [EMAIL PROTECTED] [mailto:owner- [EMAIL PROTECTED] On Behalf Of Adam Back Sent: Wednesday, December 22, 2004 11:48 PM I would think the simplest canonical counter-attack would be to make a p2p app that compares diffs in the binary output (efficiently rsync style) accumulates enough

Re: Cryptography Research wants piracy speed bump on HD DVDs

2005-01-04 Thread Ariel Waissbein
Is there really that much space for marking? Any substantial number of marked bits will become obvious in the output stream, no? Is the watermarking system robust? Is it public? And how long ago has it been published? If they are only modifying some bits (in the standard representation), then

Re: Cryptography Research wants piracy speed bump on HD DVDs

2005-01-04 Thread Ian G
Bill Stewart wrote: At 09:08 AM 12/15/2004, Ian Grigg wrote: Let me get this right. ... ... A blockbuster worth $100m gets cracked ... and the crack gets watermarked with the Id of the $100 machine that played it. ... So the solution is to punish the $100 machine by asking them to call Disney with

Re: Cryptography Research wants piracy speed bump on HD DVDs

2005-01-04 Thread Ian G
To add a postscript to that, yesterday's LAWgram reported that $10 DVD *players* are now selling in the US. The economics of player-id-watermarking are looking a little wobbly; we can now buy a throwaway player for the same price as a throwaway disk. http://www.theinquirer.net/?article=20371

Re: Cryptography Research wants piracy speed bump on HD DVDs

2004-12-22 Thread Ian Grigg
What CR does instead is much simpler and more direct. It tries to cut off any player that has been used for mass piracy. Let me get this right. ... When a pirate makes a copy of a film encoded as SPDC, the output file is cryptographically bound to a set of player decryption keys. So it is

Re: Cryptography Research wants piracy speed bump on HD DVDs

2004-12-22 Thread Matt Crawford
On Dec 15, 2004, at 11:54, Taral wrote: What stops someone using 3 players and majority voting on frame data bits? As I understand it, they use such a huge number of bits for marking, that any reasonably-sized assembly of players will still coincide on some marked bits. (However, I very much

Re: Cryptography Research wants piracy speed bump on HD DVDs

2004-12-22 Thread Taral
On Wed, Dec 22, 2004 at 10:58:11AM -0600, Matt Crawford wrote: On Dec 15, 2004, at 11:54, Taral wrote: What stops someone using 3 players and majority voting on frame data bits? As I understand it, they use such a huge number of bits for marking, that any reasonably-sized assembly of