1. Policy-Carrying, Policy-Enforcing Digital Objects Sandra Payette Cornell Digital Library Research Group

2. Digital Library Context Repositories of simple, familiar entities Repositories of complex, dynamic objects

3. Policy Enforcement Continuum repository-centric object-centric Digital Objects

4. Digital Libraries: context-specific policies Distance Education (“Lecture object”): –“guests may view course syllabus and slides 1-10 of Lecture 1, but may not view the Lecture 1 video or other slides.” –“students may not view Lecture 2 video unless they submit assignment for Lecture 1.” Library digitization (“Book object”): –“before copyright expiration on 1/1/2002 CU students can access chapters 1-6 and CU alumni can access pages 1-20 of chapter 2; after expiration, all users can access all pages of all chapters.” Business Strategy (“Technology portfolio object”): –“managers may view product specification only after product safety report has been certified by head of R&D.” –“only the executive team may run the market share simulation”

5. FEDORA: Digital Object Architecture Interoperability – among heterogeneous digital objects Interface Stability - for accessing digital objects Extensibility – of digital object behaviors Distribution - of digital object data and executables Security - flexible policy enforcement for access control Preservation - longevity of digital objects

6. FEDORA Digital Object Model Disseminations Generic interface Data Stream Data Stream Data Stream Extensible Mechanism Encapsulated service request Primitive Disseminator Typed Disseminator Internal stream

7. Extensible Behaviors - “Lecture” Content Disseminations Lecture Mechanism Dublin Core GetVideo(quality) GetSlide(seqNum) GetSyncData GetDCRecord GetDCField(name) Lecture Data Archive Video-H Policy-L (PSlang) Video-L Policy-D (PSlang) slide-2 (gif) slide-1 (gif) metadata (xml)

8. FEDORA and PoET IRM Policy Enforcement Content Disseminations Video-H Lecture Mechanism Video-L Dublin Core Java bytecode in-lined with policies at runtime slide-2 (gif) slide-1 (gif) metadata (xml) access request Policy-L (PSlang) Policy-D (PSlang)

9. Object structure view via client Digital Object Policy

10. End-User View … policies enforced transparently