Copyright Limitation

Copyright does not protect every product of the imagination, no matter how many brain cells were expended in its creation.
It is such an important law in copyright law that it bears repeating: copyright protects only particular expressions of ideas, not the ideas themselves.

Ideas are building blocks of creations.
Ideas may lead to thousands of expressions and granting control over an idea would limit creative expression.

Therefore copyright protects only particular expression of Idea and not the Idea itself.
Copyright protection is denied to procedures, processes, systems, and methods of operation, concepts, principles or discoveries.