make logo licensing clearer

[cholmes]

'I would suggest following the guidelines listed in Creative Commons Considerations for licensors and licensees. In particular, the following look relevant:
Specify precisely what it is you are licensing (i.e. your logo creations, the narrative content of the page)
Indicate rights not covered by the license (i.e. the logos of the commercial entities)
You may find HTML generated by the "Use this file on the web" links from Wikimedia Commons to be useful for specifying the license of individual images. As an example, here is the File:Logo square postgis.png entry:

'

The logos are made by Radiant and can be cc licensed.

[tylere]

Here is the link for the Creative Commons Considerations for licensors and licensees guidelines.