The economics of regulation has articulated the notions of essential facility and mandated interconnection Their application to the governance of technological knowledge can be fruitful es pecially when implemented by the adoption of the liability rule and the parallel reduction in the exclusivity of patents. Because knowledge is at the same time an output and an input in the production of new knowledge, exclusivity, traditionally associated to patents, is the cause of actual knowledge rationing with major drawbacks in terms of both static and dynamic efficiency. This institutional innovation can improve the governance of technological knowledge and increase both its rates of dissemination and generation.