Bonding Contents On Separate Storage Media

Abstract

Local storage on player instruments provides the ability for adding further amendments and most recent supplements to the optical disc content. A problem arising with this technically applicable possibility is the protection of copyrights bound to disc and supplement data. The present invention describes a technique to ensure a security framework that is able to handle this, by creating a virtual file system by merging optical disc data and local storage data based upon a common identifier.

1 . Method for generating or updating a virtual file system using first data from first read-only storage medium and second data from second storage medium, comprising the steps of
 determining from inserted first read-only storage medium first, second identifier and first data set;   receiving a command for generating or updating the virtual file system;   determining if on the second storage medium a first directory according to the first identifier, and under the first (disc_ID) are available, and if so, then performing the following steps of   reading from the second directory a second data set being a file, and extracting from the read second data set a list of files related to said application;   verifying said related files against at least one signature from the second storage medium under the first directory;   generating or updating the virtual file system to comprise said available related files.   
   
   
       2 . Method according to  claim 1 , wherein the authenticity of data read from the second storage medium is verified by a certification read from the first read-only storage medium. 
   
   
       3 . Method according to  claim 1 , wherein said application can write or create new files under the first directory according to the first identifier. 
   
   
       4 . Method according to  claim 1 , wherein the second directory is write-protected while the virtual file system exists. 
   
   
       5 . Method according to  claim 4 , wherein said files comprised within the virtual file system exist and are writable before the virtual file system is generated or updated. 
   
   
       6 . Method according to  claim 1 , wherein the second data set is certified by a signature file. 
   
   
       7 . Method according to  claim 1 , wherein the related files that are located below the first directory, but not below the second directory, are certified by separate signed certification files. 
   
   
       8 . Method for creating a virtual file system with data from first read-only storage medium and data from second storage medium, comprising the steps of
 determining from inserted first storage medium first and second identifiers;   determining if on the second storage medium a directory according to the first identifier with a subdirectory according to the second identifier is available;   upon determining that such directory or subdirectory is not available, automatically creating on the second storage medium said directory or subdirectory;   retrieving from the first storage medium or via Internet a file containing a list of files, and storing it under the second directory; and   creating a virtual file system according to the list of files.   
   
   
       9 . Method according to  claim 1 , wherein the virtual file system is maintained only as long as the read-only storage medium is accessible and otherwise removed. 
   
   
       10 . Optical read-only disc comprising data certified as described in  9 . 
   
   
       11 . Device for generating or updating a virtual file system using first data from first read-only storage medium and second data from second storage medium, comprising the steps of
 means for determining from an inserted first read-only storage medium a first identifier, a second identifier and a first data set;   means for receiving a command for generating or updating a virtual file system;   means for determining if on the second storage medium a first directory according to the first identifier, and under the first directory a second directory according to the second identifier are available, and if so, then enabling   means for reading from the second directory a second data set being a file, and extracting from the read second data set a list of files related to said application;   means for verifying said related files against at least one signature read from the second storage medium under the first directory; and   means for generating or updating the virtual file system to comprise said available related files.   
   
   
       12 . Device according to  claim 11 , further comprising
 means for determining that the read-only storage medium is no longer accessible; and   means for removing the virtual file system, upon said determining.