caliston2: Yes, it ought to work like that, but regardless of how you word it ("embargoed until such-and-such a date" or a more informal wording such as Chris's), it's not a fat lot of good if one or more of your recipients (a) totally ignores your request and (b) attempts to humiliate you in public for making it.
Anyway, in my case, if you're referring to my FRU DVD release, I hadn't put out any information of any kind myself. My press release was written but hadn't been sent anywhere. Drobe got hold of some private information via RISCOS Ltd about my DVD and chose to go public with it, without even considering the implications or attempting to ask my permission. That kind of behaviour doesn't do a lot to enhance Drobe's reputation.
I note that my comment above has already, a mere few minutes after I posted it, been moderated down to -1.3. This is despite the fact that it's entirely relevant to an important point that's been made on this threat, wholly polite and wholly constructive. What's negative or off-topic about it, that should cause it to be marked down?
I suppose this is just another example of why I said that my stand for common courtesy was futile. Clearly it is.