It probably depends on the NDA. With the OPPO Digital betas I've done, I usually couldn't even mention the existence of the beta test publicly - the only exception was the BDP-83 after they announced that there was to be an "early adopter program" that placed a bunch of players in the hands of customers who were not subject to NDA, at which point the beta testers could speak publicly about anything that was known to EAP participants. By then we'd been testing for four or five months.