The corridors at Detica's central London "Nerve Centre" are lined with portraits of the heroes of Bletchley Park, Britain's World War Two code-breaking powerhouse.

The black and white gallery acted as an reminder of the secret government business where the firm makes most of its money when The Register visited recently. We were there to discuss Detica's uncharacteristically public new venture, however: a bravely-timed saunter onto the illegal filesharing battlefield.

The BAE-owned firm has been engaged by Virgin Media to measure the level of music copyright infringement on its network via peer-to-peer protocols, on a trial basis beginning "by the end of this year". Detica plans to do this by inserting Deep Packet Inspection (DPI) probes into the ISP's network and looking inside a copy of users' traffic.
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