Generally, copyright infringement occurs when an unauthorized party reproduces, distributes, performs, publicly displays, or makes a derivative work from a copyrighted work without the permission of the copyright owner. Although the practice commonly occurs, making a copy of a protected work for a friend or for personal ease of access is prohibited and may subject the person making copies to personal liability. Additionally, making a personal copy of copyrighted material so that you can use it in a different manner may be prohibited under copyright law.
Within copyright law there is a doctrine of law known as fair use. Although fair use does not actually give permission to make copies of a work or otherwise use a work without consent, the doctrine provides a defense to copyright infringement. The factors considered when applying the doctrine of fair use include: the purpose and character of the use, the nature of the copyrighted work, the amount of the work used, and the effect the use has upon the market for the copyrighted work.
Fair Use for Educators
Educators and librarians have more leeway when making copies of copyrighted material, as educational use is generally considered fair use in most circumstances. Educators generally are not allowed to copy for the purpose of avoiding purchasing books from publishers or to copy the same items from term to term. However, educators are generally permitted to make copies of short articles or pages from a book for the purpose of teaching a class. Additionally, librarians are permitted to make archival copies of certain works in case the original work is damaged, degraded, lost or stolen.
Copyright law permits you to make one copy of your computer software for the purpose of archiving the software in case it is damaged or lost. In order to make a copy, you must own a valid copy of the software and must destroy or transfer your backup copy if you ever decide to sell, transfer or give away your original valid copy. It is not legal to sell a backup copy of software unless you are selling it along with the original.
CDs and DVDs
In addition to making a backup copy of software, it is legal to make a backup copy of a CD or DVD so that you can continue to enjoy the copyrighted material if your original copy fails. It is illegal to make copies of CDs or DVDs if you intend to distribute them to third parties, even by giving them away. Additionally, in some instances it may be unlawful to circumvent anti-piracy technology in order to make a backup copy of a CD or DVD.