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This paper investigates the role of intellectual property rights (IPRs) in the process of standardization in the telecommunications industry. We take the global system for mobile communications (GSM) case as a highly relevant example, being part of a high-tech industry in which standards play a large role. In the process of designing the GSM standard, a lot of attention has been given to IPRs, mainly to avoid a situation in which a single IPR holder could hamper or even totally block the development of the standard. Nevertheless, the ultimate GSM standard contains a large amount of so-called ‘essential IPRs’, i.e., IPRs without which the implementation of GSM products is impossible. The paper provides a general discussion of the development of GSM and presents a database on the essential IPRs in the GSM standard. This database has been compiled on the basis of international patent statistics, and the data that …