  Seeders (peers that do not request anything but contribute to the system) are
a powerful concept in peer-to-peer (P2P). They allow to leverage the capacities
of a P2P system. While seeding is a natural idea for filesharing or
video-on-demand applications, it seems somehow counter-intuitive in the context
of live streaming. This paper aims at describing the feasibility and
performance of P2P live seeding. After a formal definition of "live seeding"
and efficiency, we consider the theoretical performance of systems where the
overhead is neglected. We then propose a linear overhead model and extend the
results for this model, for a single seeder and for a set of seeders as well
(it is not always possible to perfectly aggregate individual efficiencies in a
given system).
