An apparatus includes a first storage unit configured to store first data to be backup, an encryption unit configured to generate second data by encrypting the first data by using a cryptographic key, a second storage unit configured to store the second data together with a first identifier of the first...http://www.google.com/patents/US20070022290?utm_source=gb-gplus-sharePatent US20070022290 - Information processing apparatus, control method thereof, and computer program
