URL des Cahiers : https://halshs.archives-ouvertes.fr/CAHIERS-MSE Voir aussi l'article basé sur ce document de travail paru dans "Annales d'Economie et de Statistique", INSEE-GENES, 2005, pp.241-271Cahiers de la Maison des Sciences Economiques 2006.39 - ISSN 1624-0340This paper investigates the choice of an intellectual protection regime for a process innovation. We set up a multi-stage model in which choosing between patent and trade secrecy is affected by three parameters: the patent strength defined as the probability that the right is upheld by the court, the cost of imitating a patented innovation relative to the cost of imitating a secret innovation, and the innovation size defined as the extent of the cost reduction. The choice of th...