That's what I took away from their release too. I'm guessing they know some open source licenses specifically forbid what they did due to the nmap posting and are just trying to CYA.
Most open source licenses don't forbid 'mere bundling' with some other software, even if said other software is Evil. Most likely download.com just doesn't want to have to deal with source distribution requirements from GPL/LGPL software.
I don't doubt that you are correct. This is what I was recalling and referring to from the seclist post regarding nmap:
This is exactly why Nmap isn't under the plain GPL.
Our license (http://nmap.org/book/man-legal.html) specifically adds a
clause forbidding software which "integrates/includes/aggregates Nmap
into a proprietary executable installer" unless that software itself
conforms to various GPL requirements (this proprietary C|Net
download.com software and the toolbar don't).
Can't imagine they would want to release the source code to their software at any point, it's easier to just make a blanket statement that you don't intend to bundle any open source software with it. Even if that's not what you actually do which seems to be the case according to some of the other comments.
