> The SDK is open-source, no fees required. Coming in the next week or two. We're figuring out the specific details regarding registration
It sounds like you've already figured out that the registration would have to be optional, as you're planning to make it open-source (it will be open-source once you release it, it isn't open-source yet :) ).
Open-source could still have tivoization and require registration, like Android mandatory developer signing that is supposed to be on the way.
Yeah, I guess they could offer a downloadable .tar once you've filled out your email on their website, or email it to you or whatever. Not sure you'd wanna add that sort of friction at that stage though, makes more sense to ask before publishing what you've built.