Please also read Nintendo's legal policies.
Patents
A patent is a grant of the exclusive right in an invention for a period of time. Nintendo owns many utility and design patents. There are many patents and design patents associated with Nintendo's hardware and software products.
What is a Nintendo Video Game Emulator?
A Nintendo emulator is a software program that is designed to allow game play on a platform that it was not created for. A Nintendo emulator allows for Nintendo console based or arcade games to be played on unauthorized hardware. The video games are obtained by downloading illegally copied software, i.e. Nintendo ROMs, from Internet distributors. Nintendo ROMs then work with the Nintendo emulator to enable game play on unauthorized hardware such as a personal computer, a modified console, etc.
Can I Download a Nintendo ROM from the Internet if I Already Own the Authentic Game?
There is a good deal of misinformation on the Internet regarding the backup/archival copy exception. It is not a "second copy" rule and is often mistakenly cited for the proposition that if you have one lawful copy of a copyrighted work, you are entitled to have a second copy of the copyrighted work even if that second copy is an infringing copy. The backup/archival copy exception is a very narrow limitation relating to a copy being made by the rightful owner of an authentic game to ensure he or she has one in the event of damage or destruction of the authentic. Therefore, whether you have an authentic game or not, or whether you have possession of a Nintendo ROM for a limited amount of time, i.e. 24 hours, it is illegal to download and play a Nintendo ROM from the Internet.
Isn't it Okay to Download Nintendo ROMs for Games that are No Longer Distributed in the Stores or Commercially Exploited? Aren't They Considered "Public Domain"?
No, the current availability of a game in stores is irrelevant as to its copyright status. Copyrights do not enter the public domain just because they are no longer commercially exploited or widely available. Therefore, the copyrights of games are valid even if the games are not found on store shelves, and using, copying and/or distributing those games is a copyright infringement.
Haven't the Copyrights for Old Games Expired?
U.S. copyright laws state that copyrights owned by corporations are valid for 75 years from the date of first publication. Because video games have been around for less than three decades, the copyrights of all video games will not expire for many decades to come.
3DS Pedia being a Nintendo fansite, I don't think we want to go against Nintendo's will.
Edit:
As it might presents a risk, I'll close the topic, according to the rules:
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