It's a fine question. In the past, I've had a lawyer draft a patent grant (this was in 2000, there's a bit on my Wikipedia page about it). This time, I did two

It's a fine question. In the past, I've had a lawyer draft a patent grant (this was in 2000, there's a bit on my Wikipedia page about it). This time, I did two things. First, and to make it legally very crisp, I used an Apache 2 license, which comes with an explicit patent grant. Second, renewal is coming up for the Spiro patent, and I'm not renewing it. Nor am I pursuing the provisional on the new spline work. These will take a few months to become legally binding, as theoretically I could change my mind, but the first I think makes it official right now.