Method for protection against the re-transfer of uniquely recorded information on a data carrier and apparatus for recording and/or reading re-transfer-protected information

US4649265A · kind A · utility

Assignee

• Copytex GmbH Sicherheitssysteme · DE

Inventors

• Hermann Stockburger · Bayreuth, DE
• Siegfried Bauer · Bruchsal, DE

Key dates

• Filing date: Mar 4, 1985
• Grant date: Mar 10, 1987
• Expiry date: Mar 4, 2005

Classification

• Technology area (CPC G): Physics
• CPC primary: G07F7/086
• WIPO field: IT methods for management
• WIPO sector: Electrical engineering

Abstract

A method of safeguarding against the re-transfer of uniquely recorded information on a data carrier (1) includes the recording of the information data and in addition thereto a simultaneously recording of an additional information on the data carrier (1) which reflects co-ordination characteristics relative to the data carrier. In order to carry out the method an apparatus is provided for recording and/or reading a re-transfer protected information on a data carrier (1) with a recording and/or reading device (4). The apparatus comprises a device (13) for detecting measurable properties (3) which are present at singular points of the data carrier (1) and for producing an additional information characterizing such properties.