Hi Matthias,
My immediately suggestion would be to consider using your robots.txt file to tell search engines not to index the "Full Item Page" (/items/[uuid]/full), as that's the only page where Licenses are linked to. That should cause search engine spiders to skip that file.
You'd have to modify the "src/robots.txt.ejs" file in the User Interface, and add something like this (warning: this is untested):
Disallow: /items/*/full
I *think* that would work, but my robots.txt syntax may be a little rusty.
Tim