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Learning this, I will not renew my certs with Comodo. This is childish behaviour on Comodos part. If it helps I'll advise any companies I consult to do the same until this changes. Money is the only thing this company will understand.
Turns out I have a Comodo cert expiring soon. Let's see if they do the right thing before I do...
Update, June 24 2016
We have confirmed that Comodo submitted Requests for Express Abandonment for all three trademark registration applications in question. We’re happy to see this positive step towards resolution, and will continue to monitor the requests as they make their way through the system.
We’d like to thank our community for their support.
Earlier quoted context omitted.
You don't have to register trademarks, even though it's a good idea to do so, if only for the sake of clarity. Trademarks can be established through market use (common law usage), which is what Let's Encrypt's claim is based on. Let's Encrypt will likely defend their claim, if it comes to it, through the tort of passing off: https://en.wikipedia.org/wiki/Passing_off Edit: I can English good.
So, ..., you are right they can be established, but the interplay with registered trademarks is complicated. Here's a reasonable article on it: http://www.fr.com/news/prior-user-vs-federal-registrant-whos...
Registration makes trademark ownership clear. It's not essential, but a really good idea.