They apparently don't fly with Belgian law.
The fact is, the noarchive tag is exactly backwards to the requirements of most copyright laws.
Good! The law has been looking the other way on this for too long.
In every other case, one has to ASK PERMISSION before republishing copyrighted works. Permission can also be explicity given within the work "Permission is hearby granted..." etc.
Ultimately, perhaps this needs to be precisely codified in law. "Here's how you indicate copyright in a machine-readable way on a webpage. Here's how you indicate permission to cache, permission to copy for such and such a purpose, etc."