Computer/Law Institute

Vrije Universiteit, Amsterdam

Nederlands

W.Th. Stol
Rik W. Kaspersen
J Kerstens
ER Leukfeldt
Arno R. Lodder

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Governmental filtering of websites: The Dutch case

W.Th. Stol, H.W.K. Kaspersen, J Kerstens, ER Leukfeldt, and A.R. Lodder, computer law & security review, 25:251-262, 2009.

Following the example of Norway and other European Countries, such as Sweden and

Denmark, in April 2007 the Dutch government started filtering and blocking web pages

with child pornographic content. In this paper we present a research into the technological,

legal and practical possibilities of this measure. Our study leads us to the conclusion

that the deployment of filters by or on behalf of the Dutch government is not based on any

founded knowledge concerning the effectiveness of the approach. Furthermore, the

actions of the Dutch law enforcement authorities do not avail over legal powers to filter

and block internet traffic. Consequently the Dutch filtering practice was found to be

unlawful. The government could enact a law that provides the police with the relevant

powers. However, child porn filters always cause a certain amount of structural overblocking,

which means that the government is then engaged in structural blocking of

information that is not against the law. This would be in conflict with basic rights as laid

down in the European Convention on Human Rights and Fundamental Freedoms and in

national legislation. Maintaining a blacklist that is serious in size (a necessary condition for

being effective), and at the same time is up-to-date and error-free (which is needed to

prevent overblocking), is very labour-intensive, if not impossible to maintain. From the

Dutch national police policy perspective it follows that putting so much labour in maintaining

a blacklist cannot be considered as a police task. Why then did the Dutch police

start filtering? In a society where child pornography is judged with abhorrence, in which

safety is rated higher then privacy, and in which managers and politicians frequently have

a naive faith in technology, the advocates of internet filters against child pornography

quickly find wide-spread support. Although this paper refers to the situation in The

Netherlands, it includes a number of elements and issues that are relevant to other

European States as well.