  We apply the theory of operadic Koszul duality to provide a cofibrant
resolution of the colored operad whose algebras are prefactorization algebras
on a fixed space M. his allows us to describe a notion of prefactorization
algebra up to homotopy as well as morphisms up to homotopy between such
objects. We make explicit these notions for several special M, such as certain
finite topological spaces, or the real line.
