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“The specific uses that they talk about in this [counter-terrorism] context may not be the problem, but it’s what else they can do,” said Tamir Israel, a lawyer with the University of Ottawa’s Canadian Internet Policy and Public Interest Clinic. Picking which downloads to monitor is essentially “completely at the discretion of CSE,” Israel added. The file-sharing surveillance also raises questions about the number of Canadians whose downloading habits could have been swept up as part of LEVITATION’s dragnet. By law, CSE isn’t allowed to target Canadians. In the LEVITATION presentation, however, two Canadian IP addresses that trace back to a web server in Montreal appear on a list of suspicious downloads found across the world. The same list includes downloads that CSE monitored in closely allied countries, including the United Kingdom, United States, Spain, Brazil, Germany and Portugal. It is unclear from the document whether LEVITATION has ever prevented any terrorist attacks. The agency cites only two successes of the program in the 2012 presentation: the discovery of a hostage video through a previously unknown target, and an uploaded document that contained the hostage strategy of a terrorist organization. The hostage in the discovered video was ultimately killed, according to public reports.

LEVITATION does not rely on cooperation from any of the file-sharing companies. A separate secret CSE operation codenamed ATOMIC BANJO obtains the data directly from internet cables that it has tapped into, and the agency then sifts out the unique IP address of each computer that downloaded files from the targeted websites. The IP addresses are valuable pieces of information to CSE’s analysts, helping to identify people whose downloads have been flagged as suspicious. The analysts use the IP addresses as a kind of search term, entering them into other surveillance databases that they have access to, such as the vast repositories of intercepted Internet data shared with the Canadian agency by the NSA and its British counterpart Government Communications Headquarters. If successful, the searches will return a list of results showing other websites visited by the people downloading the files – in some cases revealing associations with Facebook or Google accounts. In turn, these accounts may reveal the names and the locations of individual downloaders, opening the door for further surveillance of their activities.

Canada’s leading surveillance agency is monitoring millions of Internet users’ file downloads in a dragnet search to identify extremists, according to top-secret documents. The covert operation, revealed Wednesday by CBC News in collaboration with The Intercept, taps into Internet cables and analyzes records of up to 15 million downloads daily from popular websites commonly used to share videos, photographs, music, and other files. The revelations about the spying initiative, codenamed LEVITATION, are the first from the trove of files provided by National Security Agency whistleblower Edward Snowden to show that the Canadian government has launched its own globe-spanning Internet mass surveillance system. According to the documents, the LEVITATION program can monitor downloads in several countries across Europe, the Middle East, North Africa, and North America. It is led by the Communications Security Establishment, or CSE, Canada’s equivalent of the NSA. (The Canadian agency was formerly known as “CSEC” until a recent name change.)