> Does anyone know what that "secure write-only location" is, in practice? Does my existing computer have one, or is this a new piece of hardware?
Most modern computers have one. On UNIX systems it's generally known as /dev/null. :)
More seriously, I suspect the intent was "write-once", a.k.a. "append-only". A CD-R or DVR+/-R in packet mode would probably qualify. For that matter, an old line printer (or a receipt printer) could probably be rigged to do the job.