The question of intellectual property rights on software was raised as soon as the latter acquired a substantial degree of autonomy in relation to the hardware with which it was initially sold. Its protection was faced with a dilemma: on the one hand the need to stimulate innovation through a return on investments and, on the other, the importance of not blocking mechanisms of technology diffusion within an industrial activity characterized by the cumulative nature of technological progress and the effects of network externalities. Recourse to copyright laws, for want of an appropriate system of protection, has proved to be a more viable compromise than the patent system of which the effects of partitioning and lock-in have proved to be a c...