It was in all cases legal. NDAs are contracts and an email exchange doesn't cut it, whatever the Rybka peanut gallery purports to know.
I'd have to disagree, partially. I think that Rajlich could fairly assume that Deville would keep Rybka 1.6.1 private, that is, as an implicit non-disclosure agreement. OTOH, Deville certainly expected to receive a legal non-derivative engine in exchange for this confidence. In practise, verbal (or email) agreements might not be worth the paper they are written on, but I think they do still exist in theory.
I guess it comes down to whether you think any implicit NDA was of the form "I am giving you X. You must not share X", as opposed to "I am giving you something that I claim is X. Whatever it is, you must not share it." Given that Y was actually given, the receiver had no reason not to share Y in the first case. [I am only talking of an NDA here -- copyright infringement is another layer on top of this, but as I stated earlier, I think it fails under fair use]. I am no expert, but would guess that the former is more typical of the conditions of an NDA, and would thus be the natural candidate for anything "implicit".
Vas' 'rag tag ad hoc beer swilling candy cigarette smoking internet legal team' farts dust. He will NEVER go to court to claim "he bad because he show everybody me bad." What a load of crap. Enter a suspicious engine in an ICGA tournament and then cry 'illegal' when ICGA investigates whether the engine violates the tournament rules. That does not even merit a response. Pathetic.
I think the primordial error the Rybka forum makes is an exaggeration of what might take place. Right now, it seems that the level of "non-originality" that the ICGA is currently investigating is rather tame -- for instance, in another thread I suggested that the "punishment" might be nothing more than something like: an admission of guilt and formal apology, perhaps disqualification for 2006, changing the winner to "Fruit/Rybka" and "Rajilch/Letouzey" in 2007, and maybe some sort of a fine as a punitive measure to deter future incidents (this assumes Rybka 2.3.2a is the last one that contains any significant parts from Fruit). If the ICGA finds stronger evidence, a stronger punishment might apply. [Contrary to "popular" opinion, the ICGA and/or the Panel are not quite raving lunatics, and might very well decide to have the punishment fit the offence, as it were].