I'm not sure why you are responding to me here, but don't put words in my mouth. Your question was, "If it's patent free, why are people paying for it as I linked to?" - there are other reasons to purchase a technology than just the patent.
Let me spin it another way, and put the ball back in your court. Not that this proves anything, but has anyone (recently) purchased a license for ECC patented technology, that wasn't a license for a certicom specific implementation?
Seriously, someone who is an expert in this field (if not the expert), has already made a pretty clear statement here on patent problems wth Ed25519: http://ed25519.cr.yp.to/software.html.
As of 2015.06.11 "The authors have not been notified of any claims of patent problems wth Ed25519."
People only get hit with patent suits for commercial use that I'm aware of. They wouldn't be as it's all free and they don't monetize it. A commercial product using it is where the risk is. I'm assessing that risk.
Anyway, thanks for the link as he covers a lot of key patents and some prior art to use.
Let me spin it another way, and put the ball back in your court. Not that this proves anything, but has anyone (recently) purchased a license for ECC patented technology, that wasn't a license for a certicom specific implementation?
Seriously, someone who is an expert in this field (if not the expert), has already made a pretty clear statement here on patent problems wth Ed25519: http://ed25519.cr.yp.to/software.html.
As of 2015.06.11 "The authors have not been notified of any claims of patent problems wth Ed25519."