1. A method of securing data having security sensitive content represented by one or more security sensitive words, characters, images or data objects therein, said security sensitive content having a plurality of security levels, each security level having an associated security clearance, the method of securing data deployed in a client-server computer system with at least one server computer and a plurality of extract data stores for respective ones of said plurality of security levels, said server operatively coupled to at least one client computer and said extract data stores over a communications network comprising: accepting data input which includes security sensitive content via said client computer; extracting said security sensitive content to obtain extracted data for each corresponding security level and remainder data; storing said extracted data for each corresponding security level in the respective extract store and storing said remainder data in at least one of said client computer and server computer; and, permitting full or partial reconstruction of said data with corresponding extracted data and remainder data after accessing said respective extract stores for corresponding security levels with said associated security clearances.