1. A computerized method for classifying segments of a document and prohibiting access to classified segments of the document by an unauthorized recipient of the document, the method comprising: (a1) introducing a set of classification options, each classification option characterizing a type of information contained in a segment of the document; (b1) for each segment to be classified, specifying a classification from the set of classification options; (c1) marking said each segment to be classified in accordance with a respective classification option, producing a marked segment; (d1) classifying the document based on the classifications of the segments of the document; and (e1) generating one or more versions of the document based on a clearance level of the recipient of the document, the clearance level determining a type of information the recipient with said clearance level is entitled to access.