Method and apparatus for partial encryption of content

• US 6,976,166 B2
• Filed: 02/06/2001
• Issued: 12/13/2005
• Est. Priority Date: 02/06/2001
• Status: Expired due to Term

• Current Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Original Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Inventors: Herley, Cormac, Xu, Yihong
• Primary Examiner(s): Vu, Kim
• Assistant Examiner(s): Dada, Beemnet W
• Application Number:
  US09/776,680
• Publication Number:
  US 20020108035A1
• Time in Patent Office: 1,771 Days
• Field of Search: 705/50, 705 51- 54, 380/54, 380/200, 380/201, 713/200, 713/165, 713/189, 726/31, 726/32
• US Class Current: 713/165
• CPC Class Codes: G09C 5/00 Ciphering apparatus or methods not provided for in the preceding groups, e.g. involving the concealment or deformation of graphic data such as designs, written or printed messages
• CPC Class Codes: H04K 1/00 Secret communication
• CPC Class Codes: H04L 2209/60 Digital content management, e.g. content distribution
• CPC Class Codes: H04L 9/302 involving the integer factorization problem, e.g. RSA or quadratic sieve [QS] schemes
• CPC Class Codes: H04N 21/23476 by partially encrypting, e.g. encrypting the ending portion of a movie

Abstract

The present invention is directed to methods and apparatus that partially encrypt an information data file. An exemplary method includes dividing the information file into a first file and a second file, wherein the second file includes content from the information file to preclude reconstruction of the information file using only the first file, and encrypting the second file. Additionally, the method provides for transmitting the first file and the encrypted second file from a first device to a second device.

Claims

1. A computer implemented method of partially encrypting an information file for delivery of content comprising:

dividing an information file into a first file and a second file, wherein the second file includes content from the information file to preclude reconstruction of the information file using only the first file, and wherein use limitations are included with the information file to prevent use of the second file to reconstruct the information file more than an authorized number of times; and

encrypting the second file, wherein dividing the information file comprises;

selecting parts from the information file via a user selected pattern.

2. The method of claim 1, further comprising:

transmitting the first file and the encrypted second file to a device.

3. The method of claim 2, wherein the first file and the encrypted second file are transmitted via the Internet.

4. The method of claim 1, wherein the step of encrypting includes:

using an RSA algorithm.

5. The method of claim 1, comprising:

adding the use limitations to the second file.

6. The method of claim 1, wherein dividing the information file comprises:

selecting parts from the information file via a default pattern related to content contained in the information file, to form the second file.

7. The method of claim 2, wherein the device is a printer which includes an embedded private key needed to decrypt the second file and print the information file.

8. A system for partially encrypting an information file for delivery comprising:

a server that divides an information file into a first file and a second file, wherein the second file includes content from the information file to preclude reconstruction of the information file using only the first file, and that encrypts the second file, and wherein use limitations are included with the information file to prevent use of the second file to reconstruct the information file more than an authorized number of times;

a device that receives the first file and the encrypted second file, that decrypts the second file, and that combines the first file and the decrypted second file to reconstruct a usable version of the information file; and

a communication oath that operably interconnects the server and the device wherein the server comprises;

logic that includes the use limitations with encryption of the second file, wherein the server comprises;

logic that selects parts from the information file that form the second file via a user selected pattern.

9. The system of claim 8, wherein the communication path is the Internet.

10. The method of claim 8, wherein the second file is encrypted using a RSA algorithm.

11. The system of claim 8, wherein the server comprises:

logic that selects parts from the information file that form the second file via a default pattern related to the content contained in the information file.

12. The system of claim 8, wherein the device is at least one of a personal computer, a printer and a digital appliance.

13. The system of claim 8, wherein the device is a printer which includes an embedded private key needed to decrypt the second file and print the information file.