mkozlows wrote:
jeffluckett;134726 Wrote:
That's very true. But even if they were to devise a PERFECT digital
protection scheme, there's always the analog hole which is nearly
impossible to plug. Someone with a bit of know-how could very easily
capture the analog signals (by tapping into the speaker-outs if need
be) and simply remaster a distribution.
Granted, there will be some quality loss, but if done carefully, most
people wouldn't be able to tell the difference.
A more reasonable way is to feed the six channels of analogue audio into
a six or more channel A-D converter at 96kHz-24. Something like an
M-Audio Delta-1010 will do just fine.
That's true for audio, for now. But it's already not true for video:
Anyone making an HD-DVD or Blu-Ray disc can set the flag that prevents
analog from seeing a resolution higher than 640x480. There doesn't
appear to be any concerted movement to eliminate analog connections in
audio, for a number of good reasons, but it's not impossible in
principle.
There was a concerted effort a number of years ago to 'watermark'
analogue audio for copy protection. The aim was to have a clear mark
that was not audible. All of the tried approaches were detectable by
experienced audiophiles. The problem was that even high-end cassette
recorders were too good for the simple schemes.
A "high fidelity" analogue audio signal is supposed to be 20-20kHz flat
with correct phase. Not a lot of places to hide the watermark.
Once consumer CD burners came out, the whole analog problem became moot.
There were 'copy protection' bits in digital tape (DAT) formats, but the
spec required that 'professional' gear be able to bypass it, so in
practice it was useless.
Digital copy protection is easy with strong cryptography. But key
management for strong cryptography is not easy, which is why CSS for
DVDs failed completely.
--
Pat
http://www.pfarrell.com/music/slimserver/slimsoftware.html
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