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I have some Govt documents, which needs to be unlocked for printing. I have about 300 such documents. Do you know any FOSS software which can be used for this, it would be great if it can run in batch mode.

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Okular gives you the option to ignore DRM of any kind. You could also try the pdftk or a lightweight-reader like SumatraPDF which may ignore DRM.

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xpdf can be built to ignore DRM while printing. It includes pdftops, so you can probably use this command line.

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