github.com/shohhei1126/hugo@v0.42.2-0.20180623210752-3d5928889ad7/docs/content/en/showcase/letsencrypt/bio.md (about)

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     3  Let's Encrypt is a free, automated, and open certificate authority (CA), run for the public's benefit. It is a service provided by the [Internet Security Research Group (ISRG)](https://letsencrypt.org/isrg/).