Not illegal at all. The DMCA expressly allows the Librarian of Congress to override this stuff, for exactly the reasons you raise. https://www.federalregister.

Not illegal at all. The DMCA expressly allows the Librarian of Congress to override this stuff, for exactly the reasons you raise. https://www.federalregister.gov/articles/2015/10/28/2015-27212/exemption-to-prohibition-on-circumvention-of-copyright-protection-systems-for-access-control https://www.federalregister.gov/articles/2015/10/28/2015-272...