krb5-doc 1.12.1+dfsg-16 (amd64 binary) in ubuntu vivid

 Kerberos is a system for authenticating users and services on a network.
 Kerberos is a trusted third-party service. That means that there is a
 third party (the Kerberos server) that is trusted by all the entities on
 the network (users and services, usually called "principals").
 .
 This is the MIT reference implementation of Kerberos V5.
 .
 This package contains the installation, administrator, and user reference
 manuals for MIT Kerberos and the man pages for the MIT Kerberos
 configuration files.