US007681034B1
`
`a2) United States Patent
`US 7,681,034 B1
`(0) Patent No.:
`Mar.16, 2010
`(45) Date of Patent:
`Lee et al.
`
`(54) METHOD AND APPARATUS FOR SECURING
`ELECTRONIC DATA
`
`FOREIGN PATENT DOCUMENTS
`
`EP
`
`0 672 991 A2
`
`9/1995
`
`(76)
`
`Inventors: Chang-Ping Lee, 765 San Antonio Rd.,
`Apt. 65, Palo Alto, CA (US) 94303;
`Denis Jacques Paul Garcia, 696 Towle
`Way, Apt. 33, Palo Alto, CA (US) 94306
`
`(Continued)
`OTHER PUBLICATIONS
`
`(*) Notice:
`
`Subject to any disclaimer, the term ofthis
`patent is extended or adjusted under 35
`US.C. 154(b) by 1407 days.
`
`U.S. Appl. No. 10/076,254, filed Feb. 12, 2002, Alain Rossmann,
`Method and Architecture for Providing Pervasive Security to Digital
`Assets.
`
`(21) Appl. No.: 10/074,996
`
`(22)
`
`Filed:
`
`Feb. 12, 2002
`
`Related U.S. Application Data
`
`(Continued)
`
`Primary Examiner—Christopher A Revak
`(74) Attorney, Agent, or Firm—Sterne Kessler Goldstein &
`Fox PLLC
`
`(60) Provisional application No. 60/339,634, filed on Dec.
`12, 2001.
`
`(57)
`
`ABSTRACT
`
`(51)
`
`Int. Cl.
`(2006.01)
`GO6F 21/22
`(2006.01)
`HOAL 9/00
`(2006.01)
`HO4K 1/00
`(52) US. Chee 713/164; 713/160; 713/189;
`726/26; 705/51
`(58) Field of Classification Search .......0.0.000... None
`See application file for complete search history.
`
`(56)
`
`References Cited
`U.S. PATENT DOCUMENTS
`
`4,203,166 A
`4,734,568 A
`4,757,533 A
`4,796,220 A
`4,799,258 A
`4,827,508 A
`
`5/1980 Ehrsam etal.
`3/1988 Watanabe
`7/1988 Allen etal.
`1/1989 Wolfe
`1/1989 Davies... 380/21
`5/1989 Shear
`
`Techniques for securing electronic data and keepingthe elec-
`tronic data secured at all times are disclosed. According to
`one embodiment, a client module in a client machine is con-
`figured to provide access control to secured documents that
`maybelocated in a local store, another computer machine or
`somewhere overa data network. The client module includes a
`
`document-securing module configured to operate in a path
`through which a documentbeing accessedis causedto pass so
`that the document can be examinedor detected for the secu-
`rity nature. If the documentis secured, the document-secur-
`ing module obtains a user or group key to decrypt security
`information in the secured documentforaccess rules therein.
`If a user accessing the document is determined to have the
`access privilege to the secured document, a file key is
`retrieved from the security information and a cipher module is
`activated to decrypt the encrypted data portion with thefile
`key. Likewise, if a document is to be secured, the cipher
`module encrypts clear data from the documentto create the
`encrypted data portion. The document-securing moduleinte-
`grates proper or desired security information with the
`encrypted data portion to produce the secured document.
`
`(Continued)
`
`52 Claims, 30 Drawing Sheets
`
`Provesof accessing
`a secure document450,
`‘START
`[LAUNCH AN APPLICATION SPECIFYING
`A DOCUMENTAS A HANDLER
`T
`=—st
`CALLING IFS MANGER +.454
`ACTIVATE DOCUMENT
`456
`SECURING MODULE (DSM)
`
`RECEIVE THE SELECTED DOCUMENT
`360
`iS THE
`SE-ECTED DOCUMENT
`SECURE?
`462
`s
`| DECRYPT HEADERIN THE SECURE DOCUMENT|
`RETRIEVE ACCESS RULES.
`46
`
`
` it “USER. OES THE
`
`HAVE PROPER
`NO
`ACCESSPRIVILEGES
`
`
`RETRIEVE A FILE KEY TO DECRYPT
`
`THE ENCRYPTED DOCUMENT -}--466
`
`
`
`DISPLAY
`RETURN CLEAR CONTENTS
`MESSAGE|[IN THE SELECTED DOCUMENT
`
`
`____.cee)
`
`
`
`}|
`
`po452
`
`
`
`1-253
`
`No
`
`
`486
`
`
`Google Exhibit 1046
`Google Exhibit 1046
`Google v. Mullen
`Google v. Mullen
`
`

`

`US 7,681,034 B1
`
`Page 2
`
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`

`

`US 7,681,034 B1
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`Page 3
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`
`* cited by examiner
`
`

`

`Mar.16, 2010
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`Sheet 10 of 30
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`US 7,681,034 B1
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`Mar. 16, 2010
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`Sheet 11 of 30
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`US 7,681,034 B1
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`U.S. Patent
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`Mar. 16, 2010
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`Sheet 12 of 30
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`U.S. Patent
`
`Mar.16, 2010
`
`Sheet13 of 30
`
`US 7,681,034 B1
`
`START
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`Process of securing
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`PRODUCE A SECURED DOCUMENT
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`END
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`416
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`

`

`U.S. Patent
`
`Mar.16, 2010
`
`Sheet14 of 30
`
`US 7,681,034 B1
`
`Process of receiving
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`

`

`U.S. Patent
`
`Mar.16, 2010
`
`Sheet 15 of 30
`
`US 7,681,034 B1
`
`Process of accessing
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`a secure document 450
`Fig 4C
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