Yes, it is obviously under non-disclosure and if you had a genuine copy of 10.4.11 (assuming for the purpose of this discussion that it exists) or even Leopard you would be a beta-tester with Apple, which is by invitation only.
The fact that you state in error that there is no Apple forum to discuss seeded betas proves that you are not a genuine beta tester. If you were you would have access to it.
Please point it to me.I've been a Select member for 5 years and I've seen no discussions anywhere.