According to the invention, a field mobile terminal, such as a PDA, is adapted to a use. The mobile terminal is provided with data, which is divided into several parts. Each part concerns data connected to a certain area, and the data of each part has been encrypted by using a specific encryption key...http://www.google.com.hk/patents/US7630496?utm_source=gb-gplus-share專利 US7630496 - Arrangement and method for adapting mobile field device
