the various constituent works, than it would probably be more appropriate to classify such a collaborative work as a work of joint authorship instead of as a compilation. Rules governing subsequent changes in ownership Section 13(4) of Canada's Copyright Act states that "[t]he owner of the copyright in any work may assign the right, either wholly or partially, and either generally or subject to limitations[...]" This provision signifies that the first owner of the copyright of a newly created work can sell the copyright or any part thereof to another person. Those sales would be generally governed by the law of contract just like any other contract and so on that count are not interesting in Intellectual Property law terms. However, there are still many intellectual property questions in relation to the transfer of copyright. Many of those questions relate to the different types of transfers which are contemplated by the act and exactly what kind and what extent of intellectual property is conveyed by each of them. Different types of rights Conceptually, there are four types of transfers of copyright. They are (1) ordinary licenses, (2) sole licenses, (3) exclusive licenses, and (4) assignments. Ordinary licence An ordinary licence is merely the permission to do something which would otherwise constitute a copyright infringement. The existence of ordinary licences is a corollary of section 27.(1) of the Copyright Act, which provides that "[i]t is an infringement of copyright for any person to do, without the consent of the owner of the copyright, anything that by this act only the owner of the copyright has the right to do." It is implied in this statutory definition of primary infringement that there is no infringement when the thing is done with consent or permission of the owner of the copyright. In this manner, the copyright act recognizes permissions. Sole licence A sole license is an ordinary licence which is granted to the licensee along with a contractual promise not to provide a similar permission to anyone else. Exclusive licence An exclusive licence is an ordinary licence granted to the licensee along with a contractual promise from the copyright owner not to provide a similar permission to anyone else, and a contractual promise from the copyright owner not to do the licensed activity. Assignment An assignment is simple transfer of the ownership of the copyright. Section 13(5) of the Copyright Act states that