US Patent 7840540 Surrogate hashing

Methods, apparati, and products are provided, including running a hashing algorithm against a portion of a file to generate a hash value, determining whether the hash value is substantially similar to a stored hash value associated with another portion of another file, the portion and the another portion being standardized, and identifying a location of the another file if the hash value is substantially similar to the stored hash value associated with the another portion of the another file.