Courts have previously found that a use was fair where the use of the copyrighted work was socially beneficial. In particular, U.S. courts have recognized the following fair uses: criticism, comment, news reporting, teaching, scholarship, research and parodies.
In addition, in 1984 the Supreme Court held that time-shifting (for example, private, non-commercial home taping of television programs with a VCR to permit later viewing) is fair use. (Sony Corporation of America v. Universal City Studios, 464 U.S. 417 (1984, S.C.)
Although the legal basis is not completely settled, many lawyers believe that the following (and many other uses) are also fair uses:
Space-shifting or format-shifting - that is, taking content you own in one format and putting it into another format, for personal, non-commercial use. For instance, "ripping" an audio CD (that is, making an MP3-format version of an audio CD that you already own) is considered fair use by many lawyers, based on the 1984 Betamax decision and the 1999 Rio MP3 player decision (RIAA v. Diamond Multimedia, 180 F. 3d 1072, 1079, 9th Circ. 1999.)
Making a personal back-up copy of content you own - for instance, burning a copy of an audio CD you own.