1. A method for determining authorship of a handwritten document for which the authorship is not known, the method performed by at least one data processing system, comprising: scanning a document to produce a high-quality scanned image of the document; identifying stylus information corresponding to the document; identifying authorship information corresponding to the document; determining an authorship of the document based on the stylus information and the authorship information; and storing the stylus information, authorship information, and authorship of the document.