Create deltas between rpms
A deltarpm contains the difference between an old and a new version of a rpm, which makes it possible to recreate the new rpm from the deltarpm and the old one. You don't have to have a copy of the old rpm, deltarpms can also work with installed rpms.
You can contact the maintainers of this package via email at
deltarpm dash maintainers at fedoraproject dot org.