The decision was made to maintain secrecy so other codes could continue to be broken using the technology and techniques.

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The audience for the hour-long show consisted only of specially invited guests, while some scenes were filmed beforehand to maintain secrecy.

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But they warn that its application is being hampered by the military requirement to maintain the secrecy of raw, precise, positional information.

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The deal was reached last year, but many Swiss politicians maintain it undermines Switzerland's reputation for bank secrecy.

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