A copyright is not a patent and a patent is not a copyright. A copyright is established by the U.S. Constitution's Article I Section 8 as the right of an author to his own writings. Laws passed since then have made copyright salable, and still later, people writing for pay for a corporation relinquishes copyright rights to the corporation that paid them.
In the landmark case of Apple v Microsoft over Microsoft's use of Apple's proprietary information to make its own Windows system, Apple claimed patent infringement on the source code and the judge ruled that what was written was covered by copyright and not patent and so ruled against Apple--the rest of THAT history you know. Had that ruling gone the other way, we'd all be using Macs while Microsoft would have blown away with the dust.
That ruling also ruled that ideas cannot be copyrighted or patented, but this is long-established law. Titles cannot be copyrighted either, although those can become registered trademarks.
A copyright is a legal "strength" that gives "legal rights" to the person or group that owns the "strength". So, Pepsi is copyrighted, for example, so no one may use the name Pepsi as there product name.
a copyright is something that has been pattened so someone can not steal it. For example, a book that is not copyrighted could be copied and reused. So if its copyrighted, they have to give the person credit