Philips DVDR 80 Owner's Manual page 79

You can lock the entire disc to prevent important recordings from being erased by accident. You
can only lock the entire disc. It is not possible to lock individual recordings.
As long as these discs have not been finalized, you can protect them
against being overwritten just like DVD+RW.
1
Put the disc to be locked into the recorder.
2
While the Index Picture Screen is displayed, press
the remote control. The first title is selected.
3 Press A
. The disc information screen is displayed.
4 Press the C button.
Select the '
Confirm with C .
5
Select '
6
Press D , then press
The entire disc is now protected. If you attempt a recording,
' ' will appear on the display and '
appear on the TV screen.
If you later decide to record on the disc, follow these steps but select
' at step 5 .
'
Recording
' line.
B and confirm with
' using
to play the disc.
h on
.
' will