Abstract : In his thesis, Nori states the following theorem. Given a pointed smooth proper curve (X,D) over an algebraically closed field k, the category of finite parabolic sheaves with rational weights on (X,D) is Tannaka equivalent to the category of (finite) representations of the étale fundamental group of X-D. I will give details about this statement, give an application, and try to relate it to the theory of orbicurves.