Unlike Office-compatible apps that install directly on the tablet, this cloud-based service can't, for instance, be used to open Office documents you receive via email on the iPad.

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For instance, the option to submit offering documents confidentially with the SEC has proved popular, with companies saying it has allowed them to avoid publicizing information they wouldn't want their competitors to see.

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For instance, the convention provides that copies of documents should be certified as authentic by the country that is asked for them.

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Wizner says that keeping the documents classified makes them much more difficult to use in courts, for instance, and allows the government to avoid confirming their authenticity.

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