The "Institut National de I'Audiovisuel" (1NA) is in charge of keeping records of national TV broadcasts. Its main function is to provide TV producers with authentic sources. It also serves as a patrimonial archive library for researchers such as historians, sociologists, who study historical facts. The Opales Project is a test bed for studying new services empowered by digital video and hypermedia technology. Opales is a private portal, which enables its users to directly work on archive documents in private workspaces, to share elicited knowledge about studied documents, and to collaborate both anonymously and within groups. The paper focuses on some of the services provided and on their consequences on patrimonial archive access: Community management service supporting virtual groups of users who declare to share "points of view" about documents. Supporting knowledge exchange (import 1 export) about documents between virtual groups is the key feature of the...