golang-github-rsc-letsencrypt-dev 0.0~git20160929.0.76104d2-2 (amd64 binary) in ubuntu artful

 LetsEncrypt.org is a service that issues free SSL/TLS certificates to
 servers that can prove control over the given domain's DNS records or the
 servers pointed at by those records.
 .
 This package is a Go library that implements a client to register and get
 certificates from LetsEncrypt.org.