While I enjoyed your sarcasm it doesn't help answer the question. CentOS did't do their own backporting of fixes, nor development. They take SRPMs from RHEL and

While I enjoyed your sarcasm it doesn't help answer the question. CentOS did't do their own backporting of fixes, nor development. They take SRPMs from RHEL and do "s/RHEL/CentOS/" on them and then build the SRPMS into RPMs which get published. Not saying all of the above is trivial but I'd think the code to do it literally exists and is itself open source.