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Checksum or CRC comparison programs are used to detect unwanted changes in other programs, possibly the result of a virus at work. Change detection is good, not just for detecting a virus at work, but it can be helpful in recovery from hardware problems. Some organizations use such software to help ensure that only authorized software is in use. This report concisely describes the merits of this class of products, & helps you in selecting a product from their ranks. Rates 19 different products.