Oh, ok, got lost in translation there. But I don't think anything stops you from reverse engineering, should be fair use as long as you don't comercialize it or give proper credit.
The resources that I'm going to cite are going to be from the US copyright offices, but they should be either effectively or conceptually the same no matter the country.
FIRST:
The Definition of Fair Use
Fair use is a legal doctrine that promotes freedom of expression by permitting the unlicensed use of copyright-protected works in certain circumstances.
Section 107 of the Copyright Act provides the statutory framework for determining whether something is a fair use and identifies certain types of uses—such as
criticism, comment, news reporting, teaching, scholarship, and research—as examples of activities that may qualify as fair use.
The reason we were dumping the bootrom was for pretty much none of those things.
Maybe it could have fallen under research, but Ninty would crack down hard with legal battles to make it seem like it's only going to be used for piracy.
SECOND:
All Four Copyright Records
See how these are all registered as "computer file". Under 17 U.S.C.A. § 102, computer programs are literary works, and are subject to the same treatment for protection.
THIRD: What does copyright protect?
https://en.wikipedia.org/wiki/Copyright
Wikipedia said:
Copyright is a
legal right created by the law of a country that grants the creator of an original work
exclusive rights for its use and distribution
https://www.copyright.gov/help/faq/faq-general.html#protect
U.S. Copyright Offices said:
Copyright, a form of intellectual property law, protects original works of authorship including literary, dramatic, musical, and artistic works, such as poetry, novels, movies, songs, computer software, and architecture
FOURTH: Common Sense
Computer code has a specific use and purpose, especially in the case for something like a bootrom or other hardware level code. Unless you're developing for Ninty, you don't need access to the bootrom unless you're doing something they would classify as "shady", which is pretty much what the entirety of gbatemp is for. We're loading custom firmware, software that isn't approved by Ninty, into their hardware. We're decrypting games for uses that
they have stated that they do not like one bit. "Fair Use" doesn't apply when you're emulating a piece of software that is either A.) Illegally distributed (Roms, ISOs, etc) or B.) Illegally Obtained (ripping, decrypting, etc). The bootrom falls under B, and it can enable more of either A or B depending on how it's used.
tl;dr: It doesn't fall under fair use because we're not creating new content with it, and in our case "reverse engineering" does not fall under research, especially since we aren't modifying the code, and if we somehow AREN'T violating Fair Use, since Ninty is only allowing the bootrom to be distributed and used as part of the SOC for a 3ds, getting access to it on computer, or torrenting, or using it for sighax, or decrypting games with it is a big no no. Yet we do it anyways because it's fun poking in places you don't belong.