4. The method as claimed in claim 1 , wherein the transformation of the document fragment of the source document is a changing a visual characteristic of the document fragment of the source document.
4. The method as claimed in claim 1 , wherein the transformation of the document fragment of the source document is a changing a visual characteristic of the document fragment of the source document. 5. The method as claimed in claim 4 , wherein the changed visual characteristic of the document fragment is a font.