The importance of CSR questions seems to give to social enterprises a competitive advantage on the marketplace. Nevertheless, most of the firms of the mainstream economy have converted to the requirements of sustainable development. Consequently, what differenciates social enterprises and responsible entities based on the standard model ? Are the first perceived more responsible than the second ? Through the theory of property rights, the author tries to enlighten these two questions. He proposes an original vision on the CSR concern and leads us to go beyond the dogmatic visions to allow companies, whatever the model on which they are based (social versus conventional), to completely assume their extra-economic responsibility.