The firewire port has copy protection called 5C with some more letters, and the method of copy protection is the data stream is encrypted. If the connecting device is not 5C compliant like a D-VHS recorder, then you can only record streams that are copy freely these are not encrypted.
The D-VHS is 5C compliant and will not stream any of the copy once recordings out its firewire port unless the connected device is 5C compliant. The only other device I remember as being 5C compliant is the old Samsung SIR-T165 but it does not record.
I am not familiar with the Mac for firewire recording, but it seems like it recorded the encrypted stream, but cannot de-crypt the data.
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