Looks badgeware-ish to me, well beyond 4-clause BSD:
4-clause BSD:
All advertising materials mentioning features or use of this software must display the following acknowledgement: This product includes software developed by the <organization>.
This license:
All advertising materials
(including web pages) mentioning features or use of this software,
or software that uses this software, must display the following acknowledgment: "This product uses software developed by Spread Concepts LLC
for use in the Spread toolkit. For more information about Spread see http://www.spread.org"
When "advertising," that is, calling out or promoting, "features or use" of a particular software that has the 4-clause BSD, there is some justification for also asking for attribution. But this goes well beyond that principle both in the required statement ("for more information") and in situations where it applies, that is, on a webpage when you haven't even mentioned Spread anywhere in the body of the webpage because your software has simply used Spread but doesn't even mention, much less promote, it.
It isn't a requirement that a trademark be used, which is why I called it "badgeware-ish," but to the extent the 4-clause BSD is the upper limit on provisions like this that can be imposed and still considered free, this goes beyond it.