Any copy of a master tape of a videodisc, compact disc, etc., that is hidden or secreted (often in a safe-deposit box) so as to prevent damage, loss, or erasure in the event that it is needed again.
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Any copy of a master tape of a videodisc, compact disc, etc., that is hidden or secreted (often in a safe-deposit box) so as to prevent damage, loss, or erasure in the event that it is needed again.