The term software distribution according to wikipdedia describes a bundle of a specific software or a collection of multiple even an entire operating system Since a live CD must be bootable with an operating system the term distro does not apply here Putting a software distro on a CD such as Novell ZENworks gives you Novell ZENworks on a CD not a live CD Live CDs and live DVDs can also be fundamentally different than live USBs which is why there are two different Wikipedia pages one for CD DVDs and one for USBs