Today’s Peer-to-Peer (P2P) systems seem to work fine for file sharing applications. Though, is that true for all kinds of
applications or is it just true for file sharing of copyright protected content? In the latter case, clear incentives for
sharing exist - users download copyright protected media content for free. Even here free riding is a widespread behavior
[11]. Therefore, many file
... [Show full abstract] sharing systems introduced incentive systems, like the eMule credit system [192] or BitTorrent
[320]. Obviously, for legally used Peer-to-Peer file sharing applications giving incentives to users for sharing their resources
in a fair manner is an important feature.