I went to one of my gentoo boxes and did a 'emerge nessus' which pulled net-analyzer/nessus-plugins-2.3.1.
I cd'ed to the /usr/lib/nessus/plugins dir and did a 'ls | wc -l' to see how many plugins were installed. This showed 2314 plugins.
I then did a 'nessus-update-plugins' and re-did a 'ls | wc -l'. This showed 2479.
I deleted all the plugins in usr/lib/nessus/plugins and redid a 'nessus-update-plugins' and a 'ls | wc -l' which now shows 1114.
This last number is consistant with Tenable's count of GPL'ed plugins, so this leads me to believe the default install may include non-GPL plugins which my violate Tenable's plugin lisence.
Install = 2314 plugins
Install + nessus-update-plugins = 2479 plugins
Delete + nessus-update-plugins = 1114 plugins
Does anyone else have a reasonable explanation for this discrepancy?
This is what nessus-plugins installs (ditto for other versions).
Any license problems need to be reported upstream, it's them who distribute the original tarball.