The court order is made in secret and remains secret - meaning it would not show up in things such as Google's transparency reports, which aim to document data requests from governments around the world.

BBC: Experts warn on wire-tapping of the cloud

Combining data from different frequencies has highlighted the old ink and allowed the document to be read.

ECONOMIST: Monitor

Data from the Sharad (SHAllow RADar) instrument (on Mars Reconnaissance Orbiter), document that some of these glacial-like features, which you find at Mars' mid-latitudes, have a significant volume of ice left below a surface of rock debris.

BBC: Q&A: Liquid water on Mars

In fact safety data from study 329 had already been submitted to the regulatory authorities and had been presented publicly before this document was written.

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