Copyright protection is the term used for the rights of authors,
photographers, performing artists and certain manufacturers under
the Copyright Act.
The Act Relating to Copyright in Literary, Scientific and Artistic Works, etc. [Copyright Act] is available here.
There are many sources on the web with good information about copyright.
Clara.no is an information centre for copyright and clearance.
Clara has produced a brochure that contains a lot of good information. It's called "The Management of intellectual property rights in Norway" and can be found here.