Producing an adaptive usage control model that is compatible with UbiComp environments is a challenging task. A ubicomp system must be able to adapt its behavior based on its environment. Thus, it must respond to change in current context if it is to deliver an adaptive service. The security system that is utilized in an ubicomp environment (in order to control access in adaptive services) must accordingly be context-aware. CA-UCON model enables adaptation to environmental changes in the aim of preserving continuity of access and enhances the quality of services, striving to keep explicit interactions with the user at a minimum.