This read-create DisplayString holds a checksum, fingerprint, message digest, or other means of validating the integrity of the file referenced by etsysConfigMgmtChangeURL, and is used together with the validationMD5sum operation. Admins pre-populate it with a known-good MD5 sum before requesting validationMD5sum so the device can compare and abort the operation if the transferred file doesn't match. If left empty and validationMD5sum is requested, the device instead calculates and returns the digest in this same object, letting an admin capture the checksum of a file already on the device.