Prolog Commons: what's the trick?

The Prolog Commons (http://www.prolog-commons.org) site has a git
repository.  It claims that one accesses said repository by

git clone ssh://software.imdea.org/srv/research/prolog-commons.git

When I try this, it insists on my having a password.  Does anybody know if
there's a version of this repository out there somewhere that can be cloned
read-only?

-- 
"Perhaps people don't believe this, but throughout all of the discussions
of entering China our focus has really been what's best for the Chinese
people. It's not been about our revenue or profit or whatnot."
--Sergey Brin, demonstrating the emptiness of the "don't be evil" mantra.
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