| Sumario: | It is our great pleasure to welcome you to the ACM Symposium on Access Control Models and Technologies (SACMAT 2021). This year's symposium continues its tradition of being the premier forum for the presentation of research results and experience reports on leading-edge issues of access control, including models, systems, applications, and theory, while also embracing a renovated focus on the general area of security. The aim of the symposium is to share novel access control and security solutions that fulfill the needs of heterogeneous applications and environments, and to identify new directions for future research and development. SACMAT provides researchers and practitioners with a unique opportunity to share their perspectives with others interested in the various aspects of access control and security.
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