Earlier quoted context omitted.
Isn't 'Canonical' a trademark? Couldn't you just refer to it as DerivativeOS4 and then have a central reference table?
That reference table would have to contain Canonical or Ubuntu, though.
It keeps the source cleaner though and it wouldn't have to.
DerivativeOS4 - Debian-based operating system released in 2004 by UK Company No. 06870835.