Subject: bug#26746: [PATCH] gnu: bind: Update to 9.11.1.

From: Leo Famulari <[email-masked]>
Date: Fri, 5 May 2017 15:32:00 -0400

On Fri, May 05, 2017 at 10:38:42PM +0800, tumashu wrote:
> 
> isrgrootx1.pem is a package?  

isrgrootx1.pem is th eroot certificate of the Let's Encrypt certificate
authority:

https://letsencrypt.org/certs/isrgrootx1.pem.txt

Why do you ask? Is it related to BIND?