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3.2.4.1.5.3 Inserting SIDs and GUIDs

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Services that write Event Log entries MAY record the identity of Active Directory objects (for example, users) and security principals as insertion strings in (respectively) GUID (as specified in [MS-DTYP] section 2.3.4) and SID format. The client MAY expand these GUIDs and SIDs into readable names of objects.<55>

If the client does not attempt to resolve SID or GUID insertion codes, or if resolving them fails for any reason, the client SHOULD quote SID and GUID strings verbatim.