See also farmers repairing their tractors. Arguably you can just write DO NOT COPY on a sticker on the disc and then it's illegal to circumvent the sticker.
replyIn the US the law makes it illegal to 'circumvent a technological measure', defined as:
reply> descramble a scrambled work, to decrypt an encrypted work, or otherwise to avoid, bypass, remove, deactivate, or impair a technological measure, without the authority of the copyright owner
where
> a technological measure “effectively controls access to a work” if the measure, in the ordinary course of its operation, requires the application of information, or a process or a treatment, with the authority of the copyright owner, to gain access to the work.
A sticker doesn't count as a "technological measure".
A sticker on the data side of the disc, then! Removing the sticker is a process.
replyA sticker is not required for the ordinary course of its operation.
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