The present disclosure relates to modifying files that are part of file system in a printer or printing device. The file system is related to a database, such that the database is updated when the file system is modified. Changes to the files system are made through a request, modifying the file system...http://www.google.nl/patents/US7456991?utm_source=gb-gplus-sharePatent US7456991 - Printer based file revision databasing
