I have no idea. But fair use in the USA is usually trumped by the DMCA. I just hope that ACTA treaty never gets signed.
No person shall circumvent a technological measure that effectively controls access to a work protected under this title.
(3) As used in this subsection— (A) to “circumvent a technological measure” means to 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; and (B) 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.