Comment 20 for bug 268447

> I can't even *find* the advertising in rrdtool.

Which begs the question of how effective it is. :-)

fwiw, it's on *every* graph produced by rrdtool.
"rrdtool / tobi oetiker"

I'm not aware of any way to disable that string short of code hacks, but confess it's been about 8+ years since I last looked to try and find.