First maybe contact the manufacturer first, not the vendor.
If the harddisks are encrypted maybe it is possible to extract the encryption keys (the keys needs to be stored somewhere) and (like you said) make a copy of the harddisks.
Are you sure the HD recorder uses encryption? Never seen real encryption on HD recorders only some linux based filesystems. Maybe you can share the modelnumber so we can read the specs/manuals of this device.
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