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Whenever a file is created it is assigned a unique serial number or "CRC" (Cyclic Redundancy Check). If the file is modified in any way it is given a new CRC. Using Validator you can create your own CRC or 'Signature' for a file or group of files. This Signature is saved as a .SFV file (Simple File Verifier). When the SFV is opened by using the program or double clicking it gets the CRC of the files and compares it to the original.
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