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The DMCA doesn't care exactly how the authorization works, it only cares that it's needed.

Quote from Wikipedia[0] of DMCA section 103:

> No person shall circumvent a technological measure that effectively controls access to a work protected under this title. > "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 > 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.

[0]: https://en.wikipedia.org/wiki/Anti-circumvention_laws#Circum...