C-Cube Message Board - Msg: 1880123

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Technology Stocks : C-Cube

CUBE 36.28

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Nov 24 3:59 PM EST

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To: Kibby who wrote (20062)	7/31/1997 6:37:00 PM
From: BillyG	of 50808

I agree Kibby that Macrovision copy protection is used to protect against analog copying. It changes the analog signal enough to make it difficult to make analog (tape) copies of the output of a DVD player, for example. However, it does not change the analog signal so much that it confuses th synchronization circuitry on your analog TV set. In short, it lets you watch the DVD on your TV set, but makes it difficult to make analog copies of the DVD. On the other hand, CSS is used to prevent digital copies of DVDs. It decrypts the digital signal from the DVD at a point in the bit stream which makes it difficult to "tap into" the decrypted digital signal, therefore making it difficult to access the raw unencrypted digital video data. In a PC, CSS presumably would prevent decrypted digital data from going over the PCI bus. In a consumer DVD player, CSS supposedly would be implemented to prevent decrypted digital data from appearing on the pins of a chip where it could easily be "plucked off." Personally, I have wondered how CSS is implemented because it seems like it would be easy to "grab" the digital video data from the inputs to the video D/A converter chips.

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