ceph is not redhat
Ceph, like Linux & others, is an open-source project.
RedHat bought Inktank (or, really, some of its engineers) & is now trying to figure out how to jam a Ceph product in with its Gluster & other storage stories.
SUSE's involvement with Ceph pre-dates RedHat's & it also has engineers working on the project, including some ex-Inktank. SUSE Enterprise Storage based on Ceph has been part of SUSE OpenStack Cloud distro for a few years, and as a standalone product for about 12 months.