Copyright protects original works of authorship such as literature, music, art, and software. It is an automatic protection that exists from the moment a work is created and does not require registration with the Copyright Office. While registration is not required, it has advantages like allowing for statutory damages in infringement cases. Copyright protects the expression of ideas but not the underlying ideas themselves. It lasts for the life of the author plus 70 years for most works created after 1978.