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CSS encryption on DVDs doesn't "effectively control access to a work" because it is easy to crack. That doesn't stop copyright holders and the DMCA from deeming that DeCSS is illegal.

No, the law means "effective" in the sense of "has the effect of controlling access" not in the sense of "does a great job at it." CSS clearly does have an effect of controlling access to people trying to copy DVDs even if the encryption is weak.

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