The Super Game Boy has received a significant upgrade with the introduction of the Super Game Boy Plus, an unofficial enhancement developed by @BucketMouseBite. This new version addresses several limitations of the original Super Game Boy, which allowed Game Boy games to be played on the SNES but had a faster clock speed than the original Game Boy, affecting gameplay and compatibility with link cables.
17 U.S. Code § 1201 - Circumvention of copyright protection systems
Well that’s interesting. It does say the law won’t override fair use. But I assume it blocks it regardless.