Method and system for copy protection of displayed data content

• US 7,657,759 B2
• Filed: 06/28/2005
• Issued: 02/02/2010
• Est. Priority Date: 06/14/1998
• Status: Expired due to Fees

• Current Assignee: Kioba Processing, LLC (IP Investments Group LLC)
• Original Assignee: Finjan Software Limited (FIG LLC (d/b/a Fortress Investment Group LLC))
• Inventors: Schreiber, Daniel, Rubin, Moshe
• Primary Examiner(s): Sheikh, Ayaz R
• Assistant Examiner(s): Henning, Matthew T
• Application Number:
  US11/169,823
• Publication Number:
  US 20050240759A1
• Time in Patent Office: 1,680 Days
• Field of Search: 713/193, 345/551
• US Class Current: 713/193
• CPC Class Codes: G06F 21/10 Protecting distributed programs or content, e.g. vending or licensing of copyrighted material protection in video systems or pay television H04N7/16 ; Digital rights management [DRM]
• CPC Class Codes: G06F 21/84 output devices, e.g. displays or monitors
• CPC Class Codes: G06F 2221/2119 Authenticating web pages, e.g. with suspicious links
• CPC Class Codes: G06F 3/12 Digital output to print unit , e.g. line printer, chain printer
• CPC Class Codes: G06F 40/103 Formatting, i.e. changing of presentation of documents automatic justification G06F40/189; automatic line break hyphenation G06F40/191
• CPC Class Codes: G06F 40/109 Font handling; Temporal or kinetic typography
• CPC Class Codes: G06F 40/126 Character encoding
• CPC Class Codes: G06Q 20/102 Bill distribution or payments
• CPC Class Codes: H04L 67/02 based on web technology, e.g. hypertext transfer protocol [HTTP]
• CPC Class Codes: H04L 67/34 involving the movement of software or configuration parameters network booting or remote initial program loading [RIPL] G06F9/4416
• CPC Class Codes: H04L 9/40 Network security protocols
• CPC Class Codes: H04N 1/00244 with a server, e.g. an internet server fax-servers or the like for store and forward H04N1/324
• CPC Class Codes: H04N 1/32776 using an interactive, user-operated device, e.g. a computer terminal, mobile telephone H04N1/32782, H04N1/32784 take precedence
• CPC Class Codes: H04N 1/4426 involving separate means, e.g. a server, a magnetic card
• CPC Class Codes: H04N 1/444 to a particular document or image or part thereof
• CPC Class Codes: H04N 1/4486 using digital data encryption
• CPC Class Codes: H04N 2201/0039 Connection via a network
• CPC Class Codes: H04N 2201/3249 data relating to a linked page or object, e.g. hyperlink
• CPC Class Codes: Y10S 707/99937 Sorting
• CPC Class Codes: Y10S 707/99939 Privileged access
• CPC Class Codes: Y10S 707/99945 : Object-oriented database structure processing

Abstract

A method for altering text displayed in a formatted page, including locating a buffer of memory locations containing contents of a formatted page, locating a first text string between two markers within the buffer, the first string being an encrypted text including N characters, replacing the first text string with a second text string within the buffer, the second string being a decrypted text including M characters, where M is less than N, and inserting N-M special fill characters in the N-M unfilled memory locations between the markers within the buffer, so as to avoid the need to move the markers closer together.

Claims

1. A method of altering text for display in a formatted page, the method comprising:

locating a memory buffer containing character strings and containing markers that delineate the character strings;

locating an encrypted character string between two markers within the memory buffer;

decoding the encrypted character string to obtain a decrypted character string, the decrypted character string having fewer characters than the encrypted text string;

padding the decrypted character string with fill characters so that the padded decrypted character string has the same number of characters as the encrypted character string, wherein the fill characters are characters that are interpreted as non-visible characters by a text formatter that reads the character strings in the memory buffer and derives a page display format therefrom; and

overwriting the encrypted character string with the padded decrypted character string in the memory buffer between the two markers.

2. The method of claim 1 wherein the first character string is a sequence of Unicode characters.

3. The method of claim 1 wherein each marker is a Unicode U+FFFE character.

4. The method of claim 1 wherein each marker is a Unicode U+FDEF character.

5. The method of claim 1 wherein said padding uses a Unicode U+200F character for at least one of the fill characters.

6. The method of claim 1 wherein said padding uses a Unicode U+200E character for at least one of the fill characters.

7. The method of claim 1 wherein said padding comprises padding the fill characters in front of the decrypted character string.

8. The method of claim 7 wherein said padding comprises padding a Unicode U+200E character adjacent to the decrypted character string, and padding Unicode U+200F characters for the remaining fill characters.

9. The method of claim 1 wherein the formatted page is a web page.

10. The method of claim 1 wherein the formatted page is a document page.

11. The method of claim 1 further comprising determining a display page layout based on the contents of the memory buffer.

12. A system capable of altering text for display in a formatted page, the system comprising:

a memory buffer containing character strings and containing markers that delineate the character strings;

a search processor locating an encrypted character string between two markers within the memory buffer;

a decoder decoding the encrypted character string to obtain a decrypted character string, the decrypted character string having fewer characters than the encrypted text string; and

a text processor padding the decrypted character string with fill characters so that the padded decrypted character string has the same number of characters as the encrypted character string, wherein the fill characters are characters that are interpreted as non-visible characters by a text formatter that reads the character strings in the memory buffer and derives a page display format therefrom, and overwriting the encrypted character string with the padded decrypted character string in the memory buffer between the two markers.

13. The system of claim 12 wherein the encrypted character string is a sequence of N Unicode characters.

14. The system of claim 12 wherein each marker is a Unicode U+FFFE character.

15. The system of claim 12 wherein each marker is a Unicode U+FDEF character.

16. The system of claim 12 wherein said text processor uses a Unicode U+200F character for at least one of the fill characters.

17. The system of claim 12 wherein said text processor uses a Unicode U+200E character for at least one of the fill characters.

18. The system of claim 12 wherein said text processor pads the fill characters in front of the decrypted character string.

19. The system of claim 18 wherein said text processor pads a Unicode U+200E character adjacent to the decrypted character string, and pads Unicode U+200F characters for the remaining fill characters.

20. The system of claim 12 wherein the formatted page is a web page.

21. The system of claim 12 wherein the formatted page is a document page.

22. The system of claim 12 further comprising a display layout processor determining a display page layout based on the contents of the memory buffer.

23. A computer-readable storage medium storing program code for causing a computer to perform the steps of:

locating a memory buffer containing character strings and containing markers that delineate the character strings;

locating an encrypted character string between two markers within the memory buffer;

decoding the encrypted character string to obtain a decrypted character string, the decrypted character string having fewer characters than the encrypted text string;

padding the decrypted character string with fill characters so that the padded decrypted character string has the same number of characters as the encrypted character string, wherein the fill characters are characters that are interpreted as non-visible characters by a text formatter that reads the character strings in the memory buffer and derives a page display format therefrom; and

overwriting the encrypted character string with the padded decrypted character string in the memory buffer between the two markers.