Copyright is a legal right, existing in many countries, that grants the creator of an original work exclusive rights to determine whether, and under what conditions, this original work may be used by others. This is usually only for a limited time. Copyright is one of two types of intellectual property rights, the other is industrial property rights. The exclusive rights are not absolute but limited by limitations and exceptions to copyright law, including fair use. A major limitation on copyright on ideas is that copyright protects only the original expression of ideas, and not the underlying ideas themselves. 
This page contains full information about Copyright.