ES541987A0 - A FACILITY TO INHIBIT UNAUTHORIZED ACCESS TO INFORMATION DATA AND A CORRESPONDING OPTICAL ELEMENT. - Google Patents

A FACILITY TO INHIBIT UNAUTHORIZED ACCESS TO INFORMATION DATA AND A CORRESPONDING OPTICAL ELEMENT.

Info

Publication number
ES541987A0
ES541987A0 ES541987A ES541987A ES541987A0 ES 541987 A0 ES541987 A0 ES 541987A0 ES 541987 A ES541987 A ES 541987A ES 541987 A ES541987 A ES 541987A ES 541987 A0 ES541987 A0 ES 541987A0
Authority
ES
Spain
Prior art keywords
facility
optical element
information data
unauthorized access
corresponding optical
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
ES541987A
Other languages
Spanish (es)
Other versions
ES8802093A1 (en
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
FROST BARRY JOH
Original Assignee
FROST BARRY JOH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from GB848425017A external-priority patent/GB8425017D0/en
Application filed by FROST BARRY JOH filed Critical FROST BARRY JOH
Publication of ES8802093A1 publication Critical patent/ES8802093A1/en
Publication of ES541987A0 publication Critical patent/ES541987A0/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09C—CIPHERING OR DECIPHERING APPARATUS FOR CRYPTOGRAPHIC OR OTHER PURPOSES INVOLVING THE NEED FOR SECRECY
    • G09C5/00—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

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Record Information Processing For Printing (AREA)
  • Storage Device Security (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)
  • Controls And Circuits For Display Device (AREA)
ES541987A 1984-04-04 1985-04-03 Security system. Expired ES8802093A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8408603 1984-04-04
GB848425017A GB8425017D0 (en) 1984-10-03 1984-10-03 Security systems

Publications (2)

Publication Number Publication Date
ES8802093A1 ES8802093A1 (en) 1987-01-16
ES541987A0 true ES541987A0 (en) 1987-01-16

Family

ID=26287554

Family Applications (1)

Application Number Title Priority Date Filing Date
ES541987A Expired ES8802093A1 (en) 1984-04-04 1985-04-03 Security system.

Country Status (6)

Country Link
EP (1) EP0176538A1 (en)
AU (1) AU4154285A (en)
CA (1) CA1232080A (en)
ES (1) ES8802093A1 (en)
IL (1) IL74782A0 (en)
WO (1) WO1985004746A1 (en)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH555577A (en) * 1972-06-09 1974-10-31 Gretag Ag METHOD AND DEVICE FOR CONVERTING CLEAR GRAPHICAL INFORMATION INTO ENCRYPTED GRAPHICAL INFORMATION AND REVERSE
US3814904A (en) * 1972-10-20 1974-06-04 Rca Corp Cryptographically coded cards employing synthetic light modifying portion
US3937565A (en) * 1974-06-03 1976-02-10 Alasia Alfred Victor Process of coding indicia and product produced thereby
GB2101376B (en) * 1981-07-11 1986-05-21 John Gordon Lawrence Method and apparatus for use against counterfeiting

Also Published As

Publication number Publication date
IL74782A0 (en) 1985-07-31
ES8802093A1 (en) 1987-01-16
EP0176538A1 (en) 1986-04-09
CA1232080A (en) 1988-01-26
WO1985004746A1 (en) 1985-10-24
AU4154285A (en) 1985-11-01

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