Strategies are described for sanitizing a data set, having the effect of obscuring restricted data in the data set to maintain its secrecy. The strategies operate by providing a production data set to a sanitizer. The sanitizer applies a data directory table to identify the location of restricted data...http://www.google.com.hk/patents/US7509684?utm_source=gb-gplus-share專利 US7509684 - Strategies for sanitizing data items
