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Access control is an indispensable part of any information sharing system. Collaborative environments introduce new requirements for access control, which cannot be met by using existing models developed for non-collaborative domains. We have developed a new access control model for meeting these requirements. The model is based on a generalized editing model of collaboration, which assumes that users interact with a collaborative application by concurrently editing its data structures. Itdoi:10.1145/143457.143461 dblp:conf/cscw/ShenD92 fatcat:5iiy6wuk2vgxrlvdtugowh5mmi