I need to read up on it more or ask some experts, but my understanding is that the certificate costs like $200-500 depending on where you buy it. GlobalSign is the cheapest but doesn't support going through WHQL (
Windows Hardware Quality Labs) etc...but it's not like this is a commercial driver, so we shouldn't NEED to go through WHQL stuff as far as I know.
A certificate needs renewed or replaced annually, as far as I understand. I don't know if there are discounts, or if renewing costs less than buying, or whatever. The most important question is whether the certificate will continue to be valid once the year is up. In that case, all it takes is getting the kernel part of the driver robust and stable within a year's time, and making sure it is powerful enough that usermode code can configure it. Then, everyone can simply continue to use the same kernel driver, but add new features etc. in usermode if desired.
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