Article is devoted to analysis of evolution of the theoretical approaches to investigation of nature and sources of intellectual property right. Peculiarities of origin and contents of the industrial property theory, contractual theory, rent theory and delictual theory are investigated. Intangible construction and conception of personal rights are considered. The contents of sole rights theory, intellectual rights theory and clientella theory are analyzed.
Keywords: intellectual property right, delict, sole right, contractual theory, rent theory, theory of personal rights.