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Browse Prior Art Database

Inhibited Print for Casual Users

IP.com Disclosure Number: IPCOM000111586D
Original Publication Date: 1994-Mar-01
Included in the Prior Art Database: 2005-Mar-26
Document File: 2 page(s) / 47K

Publishing Venue

IBM

Related People

Giermann, EA: AUTHOR [+3]

Abstract

Electronic documents have analogous needs in the area of protection as their paper equivalents. Paper documents can be printed on paper that will inhibit wide-scale copying on standard copiers by use of background colors or patterns. This disclosure is for a similar electronic capability which will defeat casual users and provide proof of tampering by data processing-skilled users.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 62% of the total text.

Inhibited Print for Casual Users

      Electronic documents have analogous needs in the area of
protection as their paper equivalents.  Paper documents can be
printed on paper that will inhibit wide-scale copying on standard
copiers by use of background colors or patterns.  This disclosure is
for a similar electronic capability which will defeat casual users
and provide proof of tampering by data processing-skilled users.

      When an author wishes to make a document 'read-only', he/she
sends it through a filter that inserts control characters in random
blank spaces.  When printing is attempted, the control characters
cause the printer to jam, overprint, or otherwise mis-function,
preventing printing of a readable copy.

      With the existence of a range of common tools ranging from the
simple 'Print Screen' button to Cut-and-Paste capabilities that a
data-processing novice can use, it is difficult to protect data that
needs to be read-only.  On the other hand, there is no 'smoking-gun'
that can be used to show that possession of a copy was not entirely
accidental.  This disclosure uses the architected data stream control
characters to prevent casual copying.

      This disclosure is for a 'filter' consisting of compiled code
that converts a standard text data stream into a 'read-only' by the
following:

1.  Inserting warnings at the top, end, and intermediate (e.g., every
    25th) lines.  It may be as simple as:
         * * * Read-ON...