An example of the intent of copyright, as expressed in the United States Constitution, is “To promote the Progress of Science and useful Arts, by securing for limited Times to Authors and Inventors the exclusive Right to their respective Writings and Discoveries.”[1]

Copyright has been internationally standardized, lasting between fifty to a hundred years from the author’s death, or a shorter period for anonymous or corporate authorship. Some jurisdictions have required formalities to establish copyright, but most recognize copyright in any completed work, without formal registration. Generally, copyright is enforced as a civil matter, though some jurisdictions do apply criminal sanctions.