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The security descriptor definition language (SDDL) defines the string format that the ConvertSecurityDescriptorToStringSecurityDescriptor and ConvertStringSecurityDescriptorToSecurityDescriptor functions use to describe a security descriptor as a text string. The language also defines string elements for describing information in the components of a security descriptor.
Note
Conditional access control entries (ACEs) have a different SDDL format than other ACE types. For ACEs, see ACE Strings. For conditional ACEs, see Security Descriptor Definition Language for Conditional ACEs.