The academic debate on deep packet inspection (DPI) centres on methods of network management and copyright protection and is directly linked to a wider debate on freedom of speech on the Internet. The debate is deeply rooted in an Anglo-Saxon perspective of the Internet and is frequently depicted as a titanic struggle for the right to fundamentally free and unfettered access to the Internet.
This debate is to a great extent defined by commercial interests. These interests whether of copyright owners, Internet service providers, application developers or consumers, are all essentially economic. All of these groups have little commercial interest in restricting free speech as such. However some might well be prepared to accept a certain amount of ‘collateral damage’ to internet free speech in exchange for higher revenues.
It can be argued that more transparent and open practices from network service providers are needed regarding filtering policy and the technology used. Nevertheless these practices are unlikely to fundamentally endanger free speech. Within the international system however, there are a large number of actors who have a considerable interest in limiting free speech, most obviously states.
As this paper will argue, the link between deep packet inspection and internet censorship is of far greater concern for freedom of speech than its use in traffic shaping or preventing copyright infringement. At the present time many of the states censoring the internet are already known to use deep packet filtering.
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