For the avoidance of doubt, it is worth including in the agreement a clause stipulating that the written agreement replaces all prior agreements, oral or written, concluded between researchers. Often, it is also worth agreeing that subsequent changes to the agreement must be made in writing. In Finland, copyright is regulated by the Copyright Act (404/1961). The law protects the economic and moral rights of an author to his work. Protected display cards include fictitious or descriptive representations in writing and language, musical and dramatic works, cinematography, photographs and other works of plastic arts, products of architecture, crafts and industrial art. Copyright is valid for 70 years after the death of the author. In addition, the law also establishes related rights.