Copyright is a form of intellectual property which gives the creator of an original work exclusive rights for a certain time period in relation to that work, including its publication, distribution and adaptation; after which time the work is said to enter the public domain. Copyright applies to any expressible form of an idea or information that is substantive and discrete. Some jurisdictions also recognize "moral rights" of the creator of a work, such as the right to be credited for the work.
From http://en.wikipedia.org/wiki/Copyrights
From http://en.wikipedia.org/wiki/Copyrights