law governing the enforceability of intellectual property licences in Europe. Agreements which contain the grant of a licence by one party to another of intellectual property rights are subject to European competition (anti-trust) laws. In particular, many agreements containing licences of patent rights and rights in confidential information and technical know-how are caught by Article 81(1) of the EC Treaty, which prohibits agreements between undertakings which prevent, restrict or distort competition in the Common Market. However, because licences of intellectual property rights usually facilitate the transfer of technology from one undertaking to another, and the licensor and licensee will often operate at different levels of the market, many licences of intellectual property rights may benefit from an automatic exemption under Article 81(3) of the EC Treaty. On 1 May 2004, this exemption is being radically overhauled, as part of the European Commission#s drive to modernise European competition law. This book examines the changes in that legislation.