Fair Use and Home Reproduction of Copyrighted Works

There are some pretty narrow cases in which some one can make an unauthorized copy of a copyrighted work and it won't be considered copyright infringement. Even within these restrictions, there's a fairly narrow path you have to follow. Fair use isn't a force field, or anything like even if you're following all the rules,. The amount you use does factor into decisions about whether or not something is fair use. There is no minimum amount that is magical.