Vulnerability Development mailing list archives
Re: hacksdmi?
From: Ben Galehouse <bgalehou () PACBELL NET>
Date: Sat, 14 Oct 2000 21:23:47 -0700
"Granquist, Lamont" wrote:
I think the idea is that they tag the content that you download off of a website with a watermark, then they run it through some kind of encryption/compression algorithm to the SDMI format. The client that you use to download this is the same client that you use for playback. The watermark is tagged with a specific key which will only allow you to play it back on the client that you used to download it. Therefore, if you give the SDMI-encoded file to your friend they will not be able to play it on their player since it has a different key. This is similar to your #1, but the goal is to watermark so it can be played in *only one* SDMI player, thereby to prevent sharing by 90% of the people out there.
They'll never get rid of alternative file formats and players. The only reason to make a watermark that survives file format conversion is to assume that such conversion will happen. If they are depending on lack of alternative players, they don't need watermarking, they need tamper resistant hardware-only playback devices. DeCSS, but done with a technical clue. Which is to say expensive to do right, and difficult to maintain - look up the history of skipjack. Bascially, if everybody insists on using their own computer, life is difficult. Maybe if you figured out how afford to hand out tamper resistant cards like cue-cats... I don't think that it what their motive is. But maybe they have such hubris. I have seen a computer book technology which claims to somehow prevent the installation of debuggers. Never underestimate corporate hubris.
Current thread:
- Re: hacksdmi?, (continued)
- Re: hacksdmi? spiff (Oct 14)
- Message not available
- Re: SDMI - The way I would make the water mark. Ralph Moonen (Oct 14)
- Re: hacksdmi? Bluefish (P.Magnusson) (Oct 11)
- Re: hacksdmi? Bluefish (P.Magnusson) (Oct 11)
- Re: hacksdmi? Steve Mosher (Oct 12)
- Re: hacksdmi? David Knaack (Oct 12)
- Re: hacksdmi? Robert Johnson (Oct 13)
- Re: hacksdmi? Robert A. Seace (Oct 13)
- Re: hacksdmi? Steve Mosher (Oct 12)
- Re: hacksdmi? Granquist, Lamont (Oct 14)
- Re: hacksdmi? Ben Galehouse (Oct 15)
- Re: hacksdmi? David Knaack (Oct 16)
- Re: hacksdmi? Ralph Moonen (Oct 12)
- Re: hacksdmi? Steve Mosher (Oct 12)
- Re: hacksdmi? Bluefish (P.Magnusson) (Oct 19)
- sdmi info Phosgene (Oct 20)
- Re: hacksdmi? Steve Mosher (Oct 20)