Magnavox ZV457MG9A Owner's Manual page 55

To prevent accidental recording, editing or erasing the
titles, you can protect them from "Disc Edit" menu.
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Press [SETUP].
Use [A / v] to select "Disc Edit", then
press [OK].
Use [A / V] to select "Disc Protect
OFF ,_ ON", then press [OK].
e.g.) DVD+RW
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Use [A / V] to select "Yes", then press
[OK].
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A disc will be protected.
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EN 53