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Three cases that likely lay the groundwork for a major privacy battle at the U.S. Supreme Court are pending before federal appeals courts, whose judges are taking their time announcing whether they believe the dragnet collection of Americans' phone records is legal. It’s been more than five months since the American Civil Liberties Union argued against the National Security Agency program in New York, three months since legal activist Larry Klayman defended his thus far unprecedented preliminary injunction win in Washington, D.C., and two months since Idaho nurse Anna Smith’s case was heard by appeals judges in Seattle. At the district court level, judges handed down decisions about a month after oral arguments in the cases. It’s unclear what accounts for the delay. It’s possible judges are meticulously crafting opinions that are likely to receive wide coverage, or that members of the three-judge panels are clashing on the appropriate decision.

Attorneys involved in the cases understandably are reluctant to criticize the courts, but all express hope for speedy resolution of their fights against alleged violations of Americans’ Fourth Amendment rights.

Though it’s difficult to accurately predict court decisions based on oral arguments, opponents of the mass surveillance program may have reason for optimism.

When I first started reading Ars Technica, performance of a processor was measured in megahertz, and the major manufacturers were rushing to squeeze as many of them as possible into their latest silicon. Shortly thereafter, however, the energy needs and heat output of these beasts brought that race crashing to a halt. More recently, the number of processing cores rapidly scaled up, but they quickly reached the point of diminishing returns. Now, getting the most processing power for each Watt seems to be the key measure of performance. None of these things happened because the companies making processors ran up against hard physical limits. Rather, computing power ended up being constrained because progress in certain areas—primarily energy efficiency—was slow compared to progress in others, such as feature size. But could we be approaching physical limits in processing power? In this week's edition of Nature, The University of Michigan's Igor Markov takes a look at the sorts of limits we might face.

All of the major internet organisations have pledged, at a summit in Uruguay, to free themselves of the influence of the US government. The directors of ICANN, the Internet Engineering Task Force, the Internet Architecture Board, the World Wide Web Consortium, the Internet Society and all five of the regional Internet address registries have vowed to break their associations with the US government. In a statement, the group called for “accelerating the globalization of ICANN and IANA functions, towards an environment in which all stakeholders, including all governments, participate on an equal footing”. That’s a distinct change from the current situation, where the US department of commerce has oversight of ICANN. In another part of the statement, the group “expressed strong concern over the undermining of the trust and confidence of Internet users globally due to recent revelations of pervasive monitoring and surveillance”. Meanwhile, it was announced that the next Internet Governance Summit would be held in Brazil, whose president has been extremely critical of the US over web surveillance. In a statement announcing the location of the summit, Brazilian president Dilma Rousseff said: “The United States and its allies must urgently end their spying activities once and for all.”

AT&T said on Monday afternoon that it had withdrawn its $39 billion takeover bid for T-Mobile USA, acknowledging that it could not overcome opposition from the Obama administration to creating the nation’s biggest cellphone service provider.The company said in a statement that it would continue to invest in wireless spectrum, but could not overcome resistance from both the Justice Department and the Federal Communications Commission.

Under the terms of the deal, AT&T will pay Deutsche Telekom $4 billion in cash and wireless spectrum as a break-up fee, and the two companies will begin a seven-year roaming agreement that will expand T-Mobile’s national coverage.