The Software Preservation Network and the Cyberlaw Clinic have released "A Preservationist's Guide to the DCMA Exemption for Software Preservation."
Here's an excerpt:
The Library of Congress recently adopted several exemptions to the Digital Millennium Copyright Act (DMCA) provision prohibiting circumvention of technological measures that control access to copyrighted works. The exemptions went into effect on October 28, 2018 and last until October 28th, 2021. This guide is intended to help preservationists determine whether their activities fall under the new exemption.