Why we should include this into the repository? Keyutils provides libraries and utilities to access the kernel keyrings. Examples of programs that are able to use this are: SSSD (see T1901), Lutris (see T3822), NFS, Kerberos (which uses it for ID mapping) and GDM.
Open source? Yes
How many users do you anticipate will use this software? All users of software that uses (or is able to use) this library.
Link to source tarball/zip file: http://people.redhat.com/~dhowells/keyutils/keyutils-1.5.10.tar.bz2