Code access security is a concept of .NET Framework that restricts the execution privileges of the code on the resources and its operations. Usually administrators configure security policy of the code. This is done by sets of permissions with groups of code called as Code Groups. In the next section we will look into the code groups in detail. Using Code Access Security, the code can request for permissions to execute. Once a code has requested for permission, the permissions are granted to it based on its assembly permissions security policy. We will also be covering the types of policies in the next section.