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Within LM-X, secure store is used with borrow, grace, and trial licenses and for client store.
Note that secure store (and therefore client store) might not migrate successfully from an older version of LM-X to a newer version. For example, if you use LMX_ClientStoreSave with an older LM-X version and then attempt to use LMX_ClientStoreLoad on the same variable with a newer LM-X version, you may get the error LMX_FILE_READ_ERROR.