Patent Document ID: 9760548
Application ID: 14361812

Base Claim:
1. A system, process and method for detecting whether content within a given document is common to content within a plurality of other, existing documents, the system, process and method comprising: a character string recognizer for recognizing character strings in the content of the given document; a character string distinguisher for distinguishing main character strings and auxiliary character strings in the recognized character strings by reference to a closed list of main character strings; an encoder for encoding the content of the given document by assigning the main and auxiliary character strings differently using one or more digits; and a matcher for matching a plurality of n-digit streams from within the encoded content with any corresponding n-digit streams within previously-encoded content of the one or more other documents.

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Claim 21:
21. The system, process and method of claim 1 , wherein, in encoding the given document, the encoder assigns a different digit to each sub type of the main character strings and the main character strings are encoded using n digits, where n is in the range from 2 to 8 inclusive and n-1 digits are each used to represent 1/n by volume of a reference corpus and the 1 digit is associated with content which, when all auxiliary character strings are excluded, is not encountered in the reference corpus.