10. Apparatus according to claim 6, and further comprising: a. means for associating indicating data with said first text file data which indicates that said file is to be marked when printed; b. means for detecting whether said indicating data is associated with a document; and c. means for causing said means d to mark said document if said indicating data is present.
6. A data processing system for generating documents, comprising: a. means for obtaining a code which will be used to mark a document; b. means for obtaining a first text file; c. means for generating a sequence of value based on said marking code; d. means for successively, for each inter-word space in at least a portion of said first text file, determining one of said values according to said sequence of values and changing each said space based on said value to generate space lengths including at least first and second space lengths, said first space length being a longer space than said second, space length; and e. means for producing a second text file representing a marked version of said document.