The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 30, 2008
Filed:
Oct. 09, 2002
László Domján, Budapest, HU;
Gábor Erdei, Budapest, HU;
Pál Koppa, Budaörs, HU;
Gábor Szarvas, Budapest, HU;
Tamás Újvári, Pécs, HU;
Peter Toth, Asarum, SE;
László Domján, Budapest, HU;
Gábor Erdei, Budapest, HU;
Pál Koppa, Budaörs, HU;
Gábor Szarvas, Budapest, HU;
Tamás Újvári, Pécs, HU;
Peter Toth, Asarum, SE;
Bayer Innovation GmbH, Dusseldorf, DE;
Abstract
There is disclosed a method and apparatus for coding data, for the purpose of preventing unauthorised readout of information. In the method, user information is converted into digital data (UD), and the digital data is recorded in a first data set (CD) and a second data set (HD), where the first data set (CD) is recorded in a first optical storage medium of a data carrier, and the second data set (HD), is recorded in a second, holographic storage medium of the data carrier. According to the method, the digital data (UD) is divided between the first and second data sets (CD,HD) in a manner so that a part of the user information is contained only in the first data set (CD), and another part of the user information is contained only in the second data set (HD), and the relative proportion of the user information in the data sets is selected so that the information contained in any one of the data sets is insufficient by itself to restore the complete user information (UD) contained in both data sets.