Media-independent document security method and apparatus

• US 6,351,815 B1
• Filed: 07/29/1999
• Issued: 02/26/2002
• Est. Priority Date: 07/12/1996
• Status: Expired due to Term

• Current Assignee: Apple Inc.
• Original Assignee: Novell Incorporated (Open Text Corporation)
• Inventors: Adams, Phillip M.
• Primary Examiner(s): HUA, LY
• Application Number:
  US09/364,545
• Time in Patent Office: 943 Days
• Field of Search: 713/200, 380/51, 358/448, 382/173
• US Class Current: 726/32
• CPC Class Codes: G06T 1/0021 Image watermarking
• CPC Class Codes: H04N 1/32138 in an electronic device attached to the sheet, e.g. in an RFID tag
• CPC Class Codes: H04N 1/32144 embedded in the image data, i.e. enclosed or integrated in the image, e.g. watermark, super-imposed logo or stamp
• CPC Class Codes: H04N 2201/3233 of authentication information, e.g. digital signature, watermark
• CPC Class Codes: H04N 2201/327 which are undetectable to the naked eye, e.g. embedded codes
• CPC Class Codes: H04N 2201/3271 Printing or stamping
• CPC Class Codes: H04N 2201/3274 Storage or retrieval of prestored additional information

Abstract

A method and apparatus for providing media-independent security for a document may be programmed to create a document file having two or more components. In one embodiment, a document may include a background object, an image object (e.g. text, graphic, both, or the like), and a watermark object. When output, the image object is directly interpretable by a user. Meanwhile, in the background object, watermark object, or both, a high-resolution pattern may be stored to be output with all copies of the document. Encoded in some binary symbol in the pattern is security data. Resolution is high enough that the binary symbols are undetectable by a human eye. A processor may be programmed to recognize (e.g. read) the pattern, decode the pattern into binary data, and decode the binary data to characters directly interpretable by a user. Information relating to creation and control of a document, signature, or the like, may all be encoded independent from the principal image (e.g. text, graphic), to be virtually undetectable by human eyes, yet non-removeable by copying methods, including photocopying, scanning, electronic storage, and the like.

Claims

1. A method for media-independent security for a document, the method comprising:

inputting image data corresponding to an interpretable image displayable by a display device in an interpretable format to be readily interpretable by a user;

inputting security data corresponding to security information;

creating, in a first medium, a document comprising;

a substantive portion; and

a security portion inseparable from the substantive portion;

transferring the document into a second medium;

decoding symbols into binary security data representing the security information; and

outputting the binary security data in a format retrievable to be interpretable as the security information.

2. The method of claim 1 wherein decoding further comprises:

transforming the symbols into a bit map;

capturing a target pattern;

synchronizing reading;

orienting in accordance with a direction indicated by the target pattern; and

reading the symbols.

3. The method of claim 2 wherein the target pattern is comprised of a selected number of the symbols arranged in a pre-designated pattern.

4. The method of claim 3 wherein inputting comprises:

scanning a hardcopy of the document into a scanning device;

creating a bit map of the document; and

storing the bit map in a memory device.

5. The method of claim 4 wherein the security image is comprised of binary symbols copied in a pattern.

6. A memory device effective to store a media-independent security code and an associated document processable by a document processor, the memory device comprising:

a first block storing an executable, loadable to run on a computer as a document processor application;

a second block storing substantive data corresponding to information in a document presentable in a format interpretable directly by a user;

a third block storing security data independent but inseparable from the substantive data; and

a fourth block storing a security executable, loadable to process the security data and to include the security data in the document independently of the medium in which the document is represented.

7. The memory device of claim 6 wherein the security executable comprises instructions operable to program a computer to provide output data effective to produce a security image in the document in a security format rendering the security image uninterpretable by a viewer interpreting the document.

8. The memory device of claim 6 further comprising a rendering buffer storing output data comprising the substantive data and security data combined in a buffer format to be transmitted to an output device.

9. The memory device of claim 8 wherein the buffer format is effective to output to the output device the output data in a transfer format effective to control the output device to output in the document a substantive image corresponding to the substantive data and directly interpretable by a viewer visually inspecting the document, and to output a security image corresponding to the security data and uninterpretable by the viewer.

10. The memory device of claim 8 wherein the rendering buffer stores background data combined with the security data and effective to include the security data in a background image output by the output device in the document.

11. The memory device of claim 8 wherein the rendering buffer stores watermark data combined with the security data and effective to include the security data in a watermark image.

12. The memory device of claim 6 further comprising a pattern block comprising pattern encoding data for encoding the security data in a security image to be output in the document by an output device.

13. The memory device of claim 12 wherein the pattern block further comprises palette data corresponding to the pattern encoding data, and effective to present to a user for selection by a user, a plurality of encoding patterns corresponding the encoding data.

14. The memory device of claim 6 wherein the memory device is comprised of a plurality of storage devices adapted to receive data.

15. The memory device of claim 6 further comprising security code data corresponding to security codes obscured in a pattern unrecognizable to a user, synchronizing data to synchronize a reader to recognize the pattern, symbol interpretation data to enable the processor to read the pattern to produce a binary code, decoding data to enable the processor to decode the binary code into characters recognizable by a user.