Qu'est ce que le CPRM ID No

Sur un forum j'ai lu des propositions suivante;
1.Change HD
2. Power ON (you will get an error message on screen about hardware - Don't panic at this stage)
3.Confirmation of the CPRM ID No. as follows: press ESC then STEREO, take a note of the 9 digit number, you will need it later( same No. is on the back of recorder), Exit this mode by pressing CLEAR.
4.Deletion of the CPRM ID No.: press ESC + STEREO, input the same number as the ID number and press STOP (this happens on the LED display, not on the TV). 5. Input of the CPRM ID No. and ID data: press ESC+STEREO, input 9-digit ID number (again, this is on the LED display) then press SEARCH to register ID, after this recorder's display indicates "INSERT ID", open drawer with recorder's OPEN/CLOSE button and insert ID disc, close. After recorder's display indicates "ID DATA OK" press CLEAR button.
6. Power down and then up again. Go to setup menu and initialise drive.
J'ai besoin de votre aide.