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

US4546242A · kind A · utility

Inventors

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

Key dates

• Filing date: Oct 5, 1981
• Grant date: Oct 8, 1985
• Expiry date: Oct 5, 2001

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) which includes the recording of the information data and in addition thereto simultaneously recording of 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 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 additional information characterizing such properties.