With the rapid development of the cloud computing service, utilizing traditional access control models was difficult\nto meet the complex requirements of data protection in cloud environment. In cloud environment, the definition\nof data and its protection are gradually varied when contents shifting from one virtual machine to another; in these\nnew scenarios, the multi-tenancy pattern has been taken as a core attribute. For this reason, many users need to\nchange their roles according to different situations; certifications has impact much more complicated challenges in\ncloud environment while access control was suitable for the static status but no longer for the changing situation. In\nthis paper, a new usage control protocol modelââ?¬â?multi-UCON (MUCON) based on usage control (UCON), combined\nwith encryption technology and the digital watermarking technology, is proposed with the characteristics of flexible\naccrediting, feature binding, and off-line controlling. The analysis and simulation experiments indicate that the\nproposed protocol model is secure, reliable, and easy to be implemented, which can be deployed in cloud computing\nenvironments for data protection.
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