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FairPeers: Efficient Profit Sharing in Fair Peer-to-Peer Market Places Giancarlo Ruffo, Schifanella Rossano Dipartimento di Informatica Università degli.

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Presentation on theme: "FairPeers: Efficient Profit Sharing in Fair Peer-to-Peer Market Places Giancarlo Ruffo, Schifanella Rossano Dipartimento di Informatica Università degli."— Presentation transcript:

1 FairPeers: Efficient Profit Sharing in Fair Peer-to-Peer Market Places Giancarlo Ruffo, Schifanella Rossano Dipartimento di Informatica Università degli Studi di Torino

2 n. 2 Giancarlo Ruffo, Schifanella Rossano, Università di Torino (Italy) Key Question Is P2P mature enough for a fair, profitable, and dependable market place infrastructure?

3 n. 3 Giancarlo Ruffo, Schifanella Rossano, Università di Torino (Italy) Motivations and Target DRM vs DRM-free debate is turning to a negotiation between big actors; What about the long tail? Centralized markets are efficient and dependable. But are they scalable and economically affordable for all? P2P can significantly reduce costs, improve scalability, and distribute the profits. We, the long tail, claim that:

4 n. 4 Giancarlo Ruffo, Schifanella Rossano, Università di Torino (Italy) Insertion P2P digital distribution cycle Distribution Delivery Buying P2P Distribution Model Production User-side Industry-side Authoring

5 n. 5 Giancarlo Ruffo, Schifanella Rossano, Università di Torino (Italy) P2P Roles and Interactions Providing Interaction Partner Receiving Interaction Partner Legal Owner of the Object Mediating Service Object of Interactio n providesreceives owns the rights of facilitates the interaction The Owner can be the provider or a third party Digital Content A Peer can be both a Provider as well as a Receiver Digital content sharing service (optional)

6 n. 6 Giancarlo Ruffo, Schifanella Rossano, Università di Torino (Italy) A General Revenue Framework You can release an open platform, own the community, acquire licences, digitalize content and insert items in the network. But it is not finished yet: 1° issue: No clear economic value for owners 2° issue: No clear economic value for providers and/or mediator 3° issue: No trivial technical solutions Are these issues solvable in a realistic way?

7 n. 7 Giancarlo Ruffo, Schifanella Rossano, Università di Torino (Italy) Features of a Fair P2P Market-Place Profit Sharing All the participants are part of the revenue model (i.e., peers contribute with disk space, cpu cycles or bandwidth) The cost of an object f has an authoring component C a (f) and a distribution component C d (f) Incentives to cooperate P2P distribution : Roles of owners (i.e., author), distributors (i.e., merchant), and receivers (i.e., buyer) are interchangeable Security Mechanisms against profitable frauds and attacks by malicious peers Efficiency and scalability High volume of transactions Huge population of users Protecting Copyright Legality of items traded Other forms of licenses can be considered as well (e.g., GPL, CC) G. Ruffo, R. Schifanella FairPeers: Efficient Profit Sharing in Fair Peer-to-Peer Market Places Journal of Network and Systems Management (JNMS), September 2007 (to appear).

8 n. 8 Giancarlo Ruffo, Schifanella Rossano, Università di Torino (Italy) FairPeers: actors and roles A copy protected digital Object f The Owner of object f. This relationship is given by: a Copyright Certificate, that binds f and its owner The Distributor of object f, who has been delegated by the owner by means of: a Distribution License, that authorizes the distribution of the content The Receiver of f, that buys and downloads the object from the owner or via a (set of) licensed distributor(s) The receiver may become a distributor later on Some Mediators provide basic functionalities: Copyright Grantor (CG): stores the authorships information of all the items Certification Authority (CA): certifies for users identities (a PKI is assumed - each peer X holds a key pair ) A Broker: when a token-based accounting system with central bank is assumed

9 n. 9 Giancarlo Ruffo, Schifanella Rossano, Università di Torino (Italy) FairPeers: Publishing of an Inedited Content OwnerCopyright Grantor id f,id A :content and owner identifiers f: medatata v: value DL: Delegates list LS:lifespan CERTIFICATION REQUEST f,{id f,id A,f,v,DL} SK A {id f,id A,f,LS,v,DL} SK CG COPYRIGHT CERTIFICATE

10 n. 10 Giancarlo Ruffo, Schifanella Rossano, Università di Torino (Italy) FairPeers: Purchasing an Item from an Owner {I want id f } SK X {Cert(f)} SK A {credits A for C a (f)} SK X {License(f,X)} SK A {credits A for C d (f)} SK X XOwner f

11 n. 11 Giancarlo Ruffo, Schifanella Rossano, Università di Torino (Italy) FairPeers: Purchasing an Item from a Distributor {I want id f } SK X {License(f,Y)} SK Y {credits Y for C d (f)} SK X f {License(f,X)} SK A {credits A for C a (f)} SK X XYOwner

12 n. 12 Giancarlo Ruffo, Schifanella Rossano, Università di Torino (Italy) FairPeers: Purchasing an Item from Many Distributors Modern peer-to-peer systems allow multi- source downloads Trivial solution: all the sources must be payed. Performance deterioration (presence of a bunch of money transfers) Infeasible to manage pico-payments Lottery mechanism [Rivest, 1997]: instead of paying a fraction of distribution cost to all the distributors, only the lottery winner will gain all the value.

13 XY1Y1 YωYω YnYn Y distributors set Owner {I want id f } SK X {License(f,Y i )} SK Y i {credits A for C a (f)} SK X {License(f,X)} SK A {Y,winner indicator} SK X fifi {credits Y ω for C d (f)} SK X {The winner is Y ω } SK X

14 n. 14 Giancarlo Ruffo, Schifanella Rossano, Università di Torino (Italy) Conclusions Yes, P2P can significantly reduce costs, improve scalability, and distribute the profits This is technically feasible. Is there political and/or economic interest? The end of the DRM vs DRM-free debate may give new gasoline to P2P. Be ready to run! Social Networking and Viral Phenomena can be of great help for providing services and/or modeling the domain Please, address any further question to: or


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