From: Tim May <tcmay@got.net>
Date: Fri, 29 Aug 1997 15:51:09 +0800
To: cypherpunks@cyberpass.net
Subject: Re: need confirmation of DVD/CSS crack in China ...
In-Reply-To: <m0x3xA1-0003xeC@as-node.jena.thur.de>
Message-ID: <v0310280cb02c2c042bb8@[207.167.93.63]>
MIME-Version: 1.0
Content-Type: text/plain



At 10:44 PM -0700 8/28/97, Lucky Green wrote:
>At 07:30 AM 8/28/97 DST, Jenaer Mixmaster Anonserver wrote:
>>  DVD encryption is described on the Web at:
>>
>>    http://www.kipinet.com/tdb/tdb_oct96/feat_protection.html
>>
>>  There's a very simple way to 'break' it - you just copy the entire disk.
>>Key-size is irrelevant.
>
>I fail to see how you can prevent copying an entire disk. If the controller
>can access the data, I can copy it. Unless of course it will be made
>illegal to sell DVD controllers that output the raw data stream.
>
>Come to think of it, that must be coming.

The way it was done with DAT (Digital Audio Tape), the product similar to
DVD in so many ways, was to restrict the availability of DAT recorders
which could faithfully record the output of other DAT machines. The SCMS
system, or "Serial Copy Management System," has been in all consumer-grade
DAT machines.

Pro-grade DAT machines have no SCMS, or  SCMS-defeat switch. And there are
various SCMS defeaters widely available.

--Tim May

There's something wrong when I'm a felon under an increasing number of laws.
Only one response to the key grabbers is warranted: "Death to Tyrants!"
---------:---------:---------:---------:---------:---------:---------:----
Timothy C. May              | Crypto Anarchy: encryption, digital money,
tcmay@got.net  408-728-0152 | anonymous networks, digital pseudonyms, zero
W.A.S.T.E.: Corralitos, CA  | knowledge, reputations, information markets,
Higher Power: 2^1398269     | black markets, collapse of governments.
"National borders aren't even speed bumps on the information superhighway."