Huh? Where do you get the idea of "10 licensed copies"?
As for "rules and regulations", I assume you're referring to the TechNet license: TechNet Plus Subscriptions License Terms
My reading of it is that one licensed user gets to install as many copies as they like on equipment they use/own. For the duration of that license (ie only while they subscribe to TechNet).
Thus, I would decide its not legal. But hey, feel free to decide otherwise, just dont blame the naysayers when you get caught.
Sure, other beta programs may operate differently. But TechNet is providing full non-beta versions of MS software too.