  The framed n-discs operad fD_n is studied as semidirect product of SO(n) and
the little n-discs operad. Our equivariant recognition principle says that a
grouplike space acted on by fD_n is equivalent to the n-fold loop space on a
SO(n)-space. Examples of fD_2-spaces are nerves of ribbon braided monoidal
categories. We compute the rational homology of fD_n. Koszul duality for
semidirect product operads of chain complexes is defined and applied to compute
the double loop space homology as BV-algebra.
