A method for preventing the illegal 
copying of a copy protected content by a 
computerized system by installing a driver in the 
operating system of the 
computerized system for intercepting any attempt of the I / O routines of the 
operating system to access the device drivers of the 
Operating System, producing a CRC codes for data read from devices containing original copies, producing a CRC codes for data to be written to devices, and preventing any attempt to write such data whenever the CRC code produced match a CRC code produced for read data. The protection of content stored on a 
recordable CD can be achieved by recording on the CD a first sA method for preventing the illegal 
copying of a copy protected content by a 
computerized system by installing a driver in the 
operating system of the computerized 
system for intercepting any attempt of the I / O routines of the operating 
system to access the device drivers of the 
Operating System, producing a CRC codes for data read from devices containing original copies, producing a CRC codes for data to be written to devices, and preventing any attempt to write such data whenever the CRC code produced match a CRC code produced for read data. The protection of content stored on a 
recordable CD can be achieved by recording on the CD a first session including one or more Tracks, each of which includes unique and / or nonstandard data structures. The protected content is then recorded on the CD in a concealed form together with an 
authentication module capable of determining the existence or non-existence of the unique and / or nonstandard data structures and capable of accessing the concealed content and reveal its content. Whenever attempting to access the CD, the 
authentication module is activated, and if the unique and / or nonstandard data structures are found on the CD, the concealed content is revealed and accessed.