Copyright lasts a very long time - generallythe life of the author plus 70 years!
Example: a Web site was created in 1997 by John Smith, who dies in 2000. That Web site will be copyrighted until 2070.
In the case of an anonymous work, a pseudonymous work or a work made for hire, the copyright endures for a term of 95 years from the year of its first publication, or a term of 120 years from the year of its creation, whichever expires first.
Copyright does eventually expire, and works then pass into the "public domain" where they can be used without restriction.