JPS5536873A - Copy prevention method - Google Patents

Copy prevention method

Info

Publication number
JPS5536873A
JPS5536873A JP11048778A JP11048778A JPS5536873A JP S5536873 A JPS5536873 A JP S5536873A JP 11048778 A JP11048778 A JP 11048778A JP 11048778 A JP11048778 A JP 11048778A JP S5536873 A JPS5536873 A JP S5536873A
Authority
JP
Japan
Prior art keywords
color
different
wavelength region
region
spectral characteristics
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
JP11048778A
Other languages
English (en)
Japanese (ja)
Other versions
JPS622999B2 (enrdf_load_stackoverflow
Inventor
Satoshi Takeuchi
Akira Izawa
Yoshiaki Hida
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.)
Dai Nippon Printing Co Ltd
Original Assignee
Dai Nippon Printing Co Ltd
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
Application filed by Dai Nippon Printing Co Ltd filed Critical Dai Nippon Printing Co Ltd
Priority to JP11048778A priority Critical patent/JPS5536873A/ja
Publication of JPS5536873A publication Critical patent/JPS5536873A/ja
Publication of JPS622999B2 publication Critical patent/JPS622999B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G21/00—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge
    • G03G21/04—Preventing copies being made of an original
    • G03G21/043—Preventing copies being made of an original by using an original which is not reproducible or only reproducible with a different appearence, e.g. originals with a photochromic layer or a colour background

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Printing Methods (AREA)
  • Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
JP11048778A 1978-09-08 1978-09-08 Copy prevention method Granted JPS5536873A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11048778A JPS5536873A (en) 1978-09-08 1978-09-08 Copy prevention method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11048778A JPS5536873A (en) 1978-09-08 1978-09-08 Copy prevention method

Publications (2)

Publication Number Publication Date
JPS5536873A true JPS5536873A (en) 1980-03-14
JPS622999B2 JPS622999B2 (enrdf_load_stackoverflow) 1987-01-22

Family

ID=14536974

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11048778A Granted JPS5536873A (en) 1978-09-08 1978-09-08 Copy prevention method

Country Status (1)

Country Link
JP (1) JPS5536873A (enrdf_load_stackoverflow)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58178324A (ja) * 1982-04-13 1983-10-19 Canon Inc ゲスト・ホスト型液晶表示装置
US4586811A (en) * 1982-04-23 1986-05-06 Ricoh Company, Ltd. Confidential document reproduction prevention method
WO1994024614A1 (en) * 1993-04-19 1994-10-27 Nocopi International, Inc. Method for protecting against duplication with a color copier
US5379093A (en) * 1992-10-31 1995-01-03 Minolta Camera Kabushiki Kaisha Image processing machine capable of inhibiting copying of valuable papers
US5418602A (en) * 1992-02-27 1995-05-23 Canon Kabushiki Kaisha Image processing with anti-forgery provision
US5933520A (en) * 1994-03-25 1999-08-03 Canon Kabushiki Kaisha Image processing apparatus
WO2002051643A1 (en) * 2000-12-26 2002-07-04 National Printing Bureau, Incorporated Adiministrative Agency Authenticity discriminating printed matter and authenticity discriminating method
US6421145B1 (en) 1992-09-28 2002-07-16 Canon Kabushiki Kaisha Image processing apparatus and method using image information and additional information or an additional pattern added thereto or superposed thereon

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63243687A (ja) * 1987-01-26 1988-10-11 新日本製鐵株式会社 スクラツプの予熱方法

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58178324A (ja) * 1982-04-13 1983-10-19 Canon Inc ゲスト・ホスト型液晶表示装置
US4586811A (en) * 1982-04-23 1986-05-06 Ricoh Company, Ltd. Confidential document reproduction prevention method
US5418602A (en) * 1992-02-27 1995-05-23 Canon Kabushiki Kaisha Image processing with anti-forgery provision
US6421145B1 (en) 1992-09-28 2002-07-16 Canon Kabushiki Kaisha Image processing apparatus and method using image information and additional information or an additional pattern added thereto or superposed thereon
US7057775B2 (en) 1992-09-28 2006-06-06 Canon Kabushiki Kaisha Image processing apparatus and method using image information and additional informational or an additional pattern added thereto or superposed thereon
US7061652B2 (en) 1992-09-28 2006-06-13 Canon Kabushiki Kaisha Image processing apparatus and method using image information and additional information or an additional pattern added thereto or superposed thereon
US5379093A (en) * 1992-10-31 1995-01-03 Minolta Camera Kabushiki Kaisha Image processing machine capable of inhibiting copying of valuable papers
WO1994024614A1 (en) * 1993-04-19 1994-10-27 Nocopi International, Inc. Method for protecting against duplication with a color copier
EP0695439A1 (en) * 1993-04-19 1996-02-07 Nocopi Int Inc PROTECTION AGAINST REPRODUCTION BY COLOR COPIER
US5933520A (en) * 1994-03-25 1999-08-03 Canon Kabushiki Kaisha Image processing apparatus
WO2002051643A1 (en) * 2000-12-26 2002-07-04 National Printing Bureau, Incorporated Adiministrative Agency Authenticity discriminating printed matter and authenticity discriminating method

Also Published As

Publication number Publication date
JPS622999B2 (enrdf_load_stackoverflow) 1987-01-22

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