Intellectual property rights are generally considered to include patents, copyrights, and ownership of unpublished technical data or "know-how," and sometimes trademarks. In spite of the basic differences in character between trademarkmrights and the others, all these rights are often dealt with as a group, particularly in Europe, where they are known collectively as industrial property rights.
Harold S. Meyer, Restrictions on Use of Intellectual Property Rights, 9 Clev.-Marshall L. Rev. 85 (1960)
Intellectual Property (A Symposium)