Copyright is literally, the right to copy, though in legal terms “the right to control copying” is more accurate. Copyright are exclusive statutory rights to exercise control over copying and other exploitation of the works for a specific period of time. The copyright owner is given two sets of rights: an exclusive, positive right to copy and exploit the copyrighted work, or license others to do so, and a negative right to prevent anyone else from doing so without consent, with the possibility of legal remedies if they do.
Copyright initially only granted the exclusive right to copy a book, allowing anybody to use the book to, for example, make a translation, adaptation or public performance. At the time print on paper was the only format in which most text based copyrighted works were distributed. Therefore, while the language of book contracts was typically very broad, the only exclusive rights that had any significant economic value were rights to distribute the work in print. The exclusive rights granted by copyright law to copyright owners have been gradually expanded over time and now uses of the work such as dramatization, translations, and derivative works such as adaptations and transformations, fall within the scope of copyright. With a few exceptions, the exclusive rights granted by copyright are strictly territorial in scope, as they are granted by copyright laws in different countries. Bilateral and multilateral treaties establish minimum exclusive rights in member states, meaning that there is some uniformity across Berne Convention member states.
The print on paper format means that content is affixed onto paper and the content can’t be easily or conveniently manipulated by the user. Duplication of printed works is time-consuming and generally produces a copy that is of lower quality. Developments in technology have created new formats, in addition to paper, and new means of distribution. Particularly digital formats distributed over computer networks have separated the content from its means of delivery. Users of content are now able to exercise many of the exclusive rights granted to copyright owners, such as reproduction, distribution and adaptation.
The types of work which are subject to copyright have been expanded over time. Initially only covering books, copyright law was revised in the 19th century to include maps, charts, engravings, prints, musical compositions, dramatic works, photographs, paintings, drawings and sculptures. In the 20th century copyright was expanded to cover motion pictures, computer programs, sound recordings, choreography and architectural works.
Copyright law is typically designed to protect the fixed expression or manifestation of an idea rather than the fundamental idea itself. Copyright does not protect ideas, but only their expression is protected.