"The company's new product takes a different approach to antipiracy than it has taken for analog or audio CDs. Gervin said Macrovision engineers have spent several years looking at how various DVD-copying software packages work, and have devised ways to tweak the encoding of a DVD to block most of them.
That means the audio and video content itself requires no new hardware and isn't scrambled anew, as is the case with most rights-management techniques. Someone using one of the ripping tools on a protected DVD might simply find their software crashing, or be presented with error messages instead of a copy."
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