Logobook: A showcase of logos, symbols and trademarks
logobook.com
logobook.com
Perhaps the source is this book? Logo Modernism: https://www.amazon.co.uk/Logo-Modernism-Jens-Müller/dp/38365... (source: still the Twitter thread.)
That said, the site owner certainly holds the copyright on the site design, layout, textual content, etc. Just because it's a directory/portfolio of trademarked logos drawn by the artist doesn't mean the other content isn't covered.
Unlike other sites it costs $100 to become a LogoLounge member for a year and be able to add logos to their collection. Works well to filter out lower quality amateurish work that is prevalent on other sites.
A minor nitpick: the first example I looked at is incorrect.
http://www.logobook.com/logo/cnd/
The logo is semaphore for N and D overlayed, in a circle. It's not a birds foot.
http://www.cnduk.org/index.php?option=com_content&task=view&...
This might be helpful to get that message across with customers. I especially like the navigation via designer, country, style, etc.
edit: this should probabl be posted under show: hn