QuoteThe Library of Congress and US Copyright Office outlined the new set of exemptions to the Digital Millennium Copyright Act (DMCA) in a "final rule" document (PDF) spanning 85 pages. In it are several new protections that legally allow consumers and repair shops to hack the firmware on devices like smartphones, tablets, smart TVs, mobile computing devices, and several other gadgets where technological protection measures (TPMs, but not the same as a Trusted Platform Module) stand between the consumer and a functioning product.
even covers "computer programs, where the circumvention is undertaken on a lawfully acquired device or machine on which the computer program operates, or is undertaken on a computer, computer system, or computer network on which the computer program operates with the authorization of the owner or operator of such computer, computer system, or computer network, solely for the purpose of good-faith security research and does not violate any applicable law, including without limitation the Computer Fraud and Abuse Act of 1986."
There's also a section on videogames that covers instances "when the copyright owner or its authorized representative has ceased to provide access to an external computer server necessary to facilitate an authentication process to enable gameplay."
In such instances, a new exemption allows for "copying and modification of the computer program to restore access to the game for personal, local gameplay on a personal computer or video game console."
https://www.pcgamer.com/us-congress-deems-it-legal-to-circumvent-drm-to-repair-electronic-devices/