10. A computer-implemented method for document leakage prevention, the method comprising: applying a first procedure to sensitive documents to be protected, the first procedure using a first filter and a second filter to choose anchoring points and generating fingerprints based on the chosen anchoring points; and applying a second procedure to a target document to be inspected for sensitive text, the second procedure using the first filter, but not the second filter, to select anchoring points and generating target fingerprints based on the selected anchoring points.
10. A computer-implemented method for document leakage prevention, the method comprising: applying a first procedure to sensitive documents to be protected, the first procedure using a first filter and a second filter to choose anchoring points and generating fingerprints based on the chosen anchoring points; and applying a second procedure to a target document to be inspected for sensitive text, the second procedure using the first filter, but not the second filter, to select anchoring points and generating target fingerprints based on the selected anchoring points. 11. The method of claim 10 , wherein the first procedure is applied at a server and is used to generate a fingerprint database.