Sascha,
"There is no specific Dutch legislation that can be used to order the deregistration of Internet number resources or change the registration details of Internet number resources. Nor is there any legislation that applies to the revocation of certificates over Internet number resources."
What you are looking for is legislation (as pointed out by Malcom) that can be used to restrict/control access to the internet which appears to exist at least at a European level
There is an unfortunate tendency in lawmaking these days towards formulating legislation is such a broad way that it includes "use cases" they may have forgotten about or not thought of when writing it. Not the word "specific" in the above, this does not mean that applicable legislation does not exist!
You miss the next sentence of the legal advise: "In the absence of such legislation, a court cannot order the revocation of certificates." I think the legal statement (when read as a whole, not cherry-picking the parts you like) was clear enough. Sander