With the Wii being one of the most popular games consoles, it's no wonder that many people are interested in making legal copies of their games, so they can play their backups instead of risking their original versions. However, because the Wii has a series of copyright protection measures, you need to be sure that you can copy and backup the games without having to void that warranty or have any other issues.
Because Wii games are actually written to DVD, Nintendo has employed a simple and effective way to stop piracy. They have used encryption with their Wii games, meaning that the games are burnt in a "language" which only a Nintendo Wii can read. This means that if you wanted to copy or duplicate the game, you would need to have a computer which could read this special encrypted language.
The encryption of Wii discs means that if you try and copy them – legally or illegally – your computer is just going to read a bunch of gibberish which will make no sense. This means that if you want to then copy that data onto another disc, your PC is just going to end up copying a selection of jumbled words and text. This is the reason why many people can not copy Wii games, and is why even more get mod chips – so they can get their Wii to read unencrypted discs.
To get around this problem, you simply need to make perfect 1: 1 copies of your encrypted game discs. Your Wii does not know if the disc you have is real or original, it's only by what encryption it has, that it knows whether to play it or not. So if you want to copy your games, you just need to be able to get a tool or a technique which allows your PC to read and copy the encrypted Wii game DVDs, and these are few and far between.
Source by Jack Hoffmann