Just for the record. If anyone is having his own monticello repository like me 
using apache a rule
RewriteEngine On
RewriteCond %{REQUEST_METHOD} ^PUT
RewriteCond %{REQUEST_FILENAME} -f
RewriteRule . - [F,L]
will prevent overwriting of packages. The full story is at

http://norbert.hartl.name/blog/public-monticello-repository

Norbert

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