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An OWL Copyright Ontology for Semantic Digital Rights Management International Workshop on Web Semantics SWWS06 Roberto García Rosa Gil November 2, 2006.

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Presentation on theme: "An OWL Copyright Ontology for Semantic Digital Rights Management International Workshop on Web Semantics SWWS06 Roberto García Rosa Gil November 2, 2006."— Presentation transcript:

1 An OWL Copyright Ontology for Semantic Digital Rights Management International Workshop on Web Semantics SWWS06 Roberto García Rosa Gil November 2, 2006 Montpellier, France

2 Table of Contents Introduction Objectives Conclusions Future Work Specification Conceptualisation Implementation Evaluation

3 Introduction Digital media: easy production and copy Digital Rights Management (DRM) Windows Media DRM, iTunes FairPlay, RealNetworks Helix, Sony MagicGate… DRM copy play …

4 Introduction Internet: easy distribution DRM interoperability DRM REL

5 Introduction Need for a standard REL (Rights Expression Language) Some efforts: –XML-based RELs –Creative Commons simple predefined licenses

6 Introduction DRM Watch 1 : 2005 Review DRM Standards –…consumer complaints have moved beyond overly restrictive DRMs to lack of interoperability among them… –…we see no production implementations… –…ContentGuards asserts its patents apply to any REL implementation in DRM… Electronic Frontier Foundation 2 –…fail to accommodate… copyright regimes. –…based on an analogy with contract law. 1 http://www.drmwatch.com 2 http://www.eff.org

7 Objectives Standardisation difficulties –Internet/Web open and heterogeneous –Copyright complex domain –High level of abstraction (not bits or pixels) Concentrate on the roots, formalise SEMANTICS ODRL Duplicate Reproduction Right Copy MPEG-21 Adapt CC Reproduction Copyright

8 Objectives Knowledge Representation: Ontology Web Ontology: Semantic Web Increased expressivity: –Formalise semantics –Facilitate interoperability and implementation –Overcome REL patent –Include copyright –Support full value chain, not just users licenses

9 Table of Contents Introduction Objectives Conclusions Future Work Specification Conceptualisation Implementation Evaluation

10 Specification Copyright domain analysis Generic Ontology –WIPO worldwide harmonisation 1 Literary, artistic and scientific works (not ideas) Maybe derived, but always original 1 World Intellectual Property Organisation Copyright Treaty, 1996

11 Specification Applicable to the Controlled P2P metadata diffusion scenario Peer A Peer B Make Available Right Reproduction Right Scenario

12 Conceptualisation Complex domain, build model in three steps: Creation Model Rights Model Action Model

13 Conceptualisation Les Misérables Creation Model

14 Conceptualisation Rights Model

15 Conceptualisation End-users do not hold rights –Usage licenses –Special permissions: Quotation Education Information Official Act Private Copy Parody Temporary Reproduction Rights Model

16 Conceptualisation Actions, the building blocks Action Model

17 Conceptualisation Actions governed by Economic Rights: –Reproduction Right: reproduce, copy –Distribution Right: distribute; sell, rent, lend –Public Performance Right: perform –Fixation Right: fix, record –Communication Right: communicate; retransmit, broadcast, make available –Transformation Right: transform; adapt, translate Action Model

18 Conceptualisation End-user actions, consumption, to use a… –manifestation: buy –instance: buy –performance: assist –communication: access broadcast: tune something made available: access picture, sculpture book, CD, DVD projection, recital, exhibition TV channel, radio station web page, stream Action Model

19 Conceptualisation Licensing actions: agree, disagree Altogether: copyright value chains –E.g. serials adapted from literary works Action Model

20 Conceptualisation Case roles: relate actions and its participants Action Model

21 Conceptualisation Controlled P2P metadata diffusion scenario… Scenario Action Model

22 Implementation One conceptual model, many implementations Semantic Web Implementation with OWL OWL-DL variant –enables tractable and decidable reasoning for use-license checking Semantic Web Rule Language OWL Full OWL DL OWL Lite + expressivity - complexity

23 Implementation Licences and Rights implemented as Classes Uses implemented as Instances if u Copy Pattern then license pattern authorises u Reproduction Right Copy Copyright Copy Pattern u ?

24 Implementation Pattern Copy Pattern pointInTime. 2006-01-01, 2006-06-30 agent.{granted} origin.{peerA} theme.{fragment01} ( 2 recipient) recipient.{peerB, peerC, peerD} Scenario Agree Problem

25 Implementation Problem: Open World Assumption (OWA) OWA sensible constructs: –maxCardinality ( n): new facts can make cardinality n –allValuesFrom (R.C) … OWA insensible constructs: –minCardinality ( n): new facts, no change –… 0132 maxCardinality 2 (n 2) minCardinality 3 (n 3) New facts OPEN WORLD

26 Implementation Metalevel negation to overcome OWA Agree OWA insensible constructs –,,… Disagree negated OWL sensible constructs –R.C R.¬C – n n+1 Allowed(u) Agree.theme(u) ¬Disagree.theme(u)

27 Implementation Pattern Copy Pattern pointInTime. 2006-01-01, 2006-06-30 agent.{granted} origin.{peerA} theme.{fragment0001} Pattern Pattern ( ( 3 recipient) recipient.(¬{peerB, peerC, peerD}) ) Scenario Agree Disagree

28 Implementation Scenario [ a Copy; agent :granted;origin :peerA; theme :fragment02;recipient :peerB ] Copy Pattern [ a Copy; agent :granted;origin :peerA; theme :fragment01;recipient :peerC, :peerD ] Pattern [ a Copy; agent :granted;origin :peerA; theme :fragment01;recipient :peerB, :peerC, :peerE ] Allowed

29 Evaluation Put into practice: SemDRMS Semantic Digital Rights Management Systems –Controlled P2P metadata diffusion Peer A SemDRMS copy make available Licenses Store DL Reasoner

30 Table of Contents Introduction Objectives Conclusions Future Work TABLE OF CONTENTSNSNNNNSK Specification Conceptualisation Implementation Evaluation

31 Conclusions Concentrate on semantics Ontology, more expressivity Include copyright Facilitate implementation and interoperability –DL reasoners for license checking

32 Future Work Full SemDRMS based on OWL-DL Copyright Ontology Mappings to Copyright Ontology –MPEG-21 REL Ontologies –OMA/ODRL Ontologies –Creative Commons Security and trust through RDF signatures Human-readable by Controlled Natural Languages XML Semantics Reuse (XSD2OWL + XML2RDF)

33 Thank you for your attention http://rhizomik.net/ontologies/copyrightonto http://rhizomik.net/semdrms Roberto García roberto@rhizomik.net


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