Let's Encrypt is a nonprofit aimed at encrypting the entire web. It provides free certificates, and its service is backed by EFF, Mozilla, Cisco, Akamai and others. Despite it being around for years, security firm Comodo, which as of 2015, was the largest issuer of SSL certificates with a 33.6% market share on 6.6% of all web domains, last year in October filed for the trademark Let's Encrypt. The team at Let's Encrypt wrote in a blog post today that they have asked Comodo to abandon its "Let's Encrypt" applications, directly but it has refused to do so. The blog post adds: We've forged relationships with millions of websites and users under the name Let's Encrypt, furthering our mission to make encryption free, easy, and accessible to everyone. We've also worked hard to build our unique identity within the community and to make that identity a reliable indicator of quality. We take it very seriously when we see the potential for our users to be confused, or worse, the potential for a third party to damage the trust our users have placed in us by intentionally creating such confusion. By attempting to register trademarks for our name, Comodo is actively attempting to do just that. Update: 06/23 22:25 GMT by M :Comodo CEO has addressed the issue on company's forum (screenshot).