You're paraphrasing the parent, and seem to be confusing Open Source (which is a class of licenses) with trademarks.

You're right, HP still control the trademarks. But for a license to meet the Open Source Definition, there can be no 'non-commercial' restrictions.

So selling 'Foo' (derived from WebOS) is fine.But using the WebOS trademark isn't.

Just like Oracle distribute and sell support for 'Oracle Enterprise Linux' - 'Red Hat Enterprise Linux' is a trademark that belongs to Red Hat.

See CentOS; reduce sarcasm.

But is CentOS called "Red Hat"? No, it's called CentOS. With the comment I made, I was saying you wouldn't be able to release WebOS without HP's permission. Just like you can't release Red Hat without Red Hat's permission, so you fork it and use your own trademark.

That's a totally different matter which has nothing to do with what you were talking about earlier. Trademark and Free Software are two completely different things… (unlike copyright and patent law, where the code itself is directly licensed under copyright law and has to deal with patent law; however there is almost never a trademark license…)