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...http://www.google.de/patents/US7430294?utm_source=gb-gplus-sharePatent US7430294 - Method and apparatus for the encryption of data
