https://learn.microsoft.com/id-id/dotnet/api/system.security.permissions.isolatedstoragefilepermission.issubsetof?view=netframework-4.8
IsolatedStorageFilePermission.IsSubsetOf(IPermission) Method (System.Security.Permissions) |...
Determines whether the current permission is a subset of the specified permission.
system securitymethodpermissions