Copyright is normally associated with art and literature (e.g. painting, drawings, sculpture, films etc.), but in industry it also applies to technical drawings, technical reports and software. Copyright protection arises automatically upon creation of the work and infringement requires copying of the original work. The duration of copyright protection for written works, art, drawings etc. is 70 years from creation of the work (for a company) or life of the author + 70 years (for books, art etc.)

The usual copyright marking that you will have seen is something like © [owner] [year] – where the year indicates the year of creation or publication.