Photocopy machines are great at making copies of copyrighted material, and are completely legal in the US. The entire internet routinely makes copies every time you visit a web page.

What's illegal in the US is selling tools for breaking DRM: https://www.androidpolice.com/2018/10/26/us-copyright-office...

From a quick google, open source tools for breaking DRM are legal, and so is breaking DRM for personal use: https://www.google.com/search?q=are+drm+defeating+tools+ille...