So you can reset any of the Sony SCUM (SCMS, serial copy management system) to 00 with the DA30 if needed(pro decks with XLR ins/outs typically reset SCMS code to 00 if it wasnt already). I busted the SCUM (reset SCMS code to 00 which means unlimited cloning allowed) with a Fostex D5, though I rarely needed to. Nice phones, I used to have the 240 DF which I used with a Mackie 1402 VLZ when mixing soundboard feeds with a pair of mics.
I was trying to find a pic of the back panel of the 1000ES to see if it has XLR ins/outs (analog) but could not find a pic(dont think it does). Generally speaking, (perhaps with Sony being an exception? since I think? the 2000ES has XLR analog ins/outs?) decks that did were considered pro decks and (when used as clone deck) would reset the SCMS code (embedded in the data on the tape) to 00 which meant unlimited digital clones could be made in the future of that tape. But this is Sony who invented SCMS and I seem to recall NONE of their decks (even the mighty TOTL 2000ES) would do this. My 690 and 60ES did not. Pretty much all (I believe all actually) Tascam decks, even the BOTL DA-20 were pro decks and would reset SCMS to 00. Same with Fostex decks, all were considered pro decks (even BOTL D5 which is a workhorse) and reset the code to 00. 99% of grateful dead trades were already 00 but every once in a while I would "bust the SCUM". Sony was worried everyone was going to buy a DAT and clone CDs which is why they came out with it. It allowed for 2 clones. A clone could be made of an original source and a clone could be made of that clone, but no clones could be made of that clone, unless the SCUM was busted and once it was busted one could make unlimited clones of a given DAT, even on "consumer" decks (ie no analog XLR in/outs).
The Cassette Deck Shootout is featured in this article written by Brent Butterworth. I had my deck serviced not long after the Shootout (2013) and that was the only service it had since 1990. And it's due for another service.