That policy was posted on the Judge list. I can't find the original email but here is the relevant excerpt I had archived :
Deck lists are a tool for verification, and are not public information.
Because our own media coverage can create an imbalance in the availability of this information, we sometimes decide to share deck lists among Top 8 competitors. (This is typical for multi-day events with on-line coverage - Pro Tours, Worlds, some National Championships and even some Grand Prix.)
For your local events, deck lists remain private and thus there is no need to share them.
--
Thanks! -- Scott Marshall
DCIJUDGE-L NetRep, L4, Denver
Ah, I see I left out a sentence - mea culpa. "Decklists are not public information and should not be shared with other competitors."
--
Thanks! -- Scott Marshall
DCIJUDGE-L NetRep, L4, Denver