I'm in favour of Adrian's patch. It's an improvement with additional sanity 
checks on the ByteRange values. 
Indeed I tried to see if you could check if a given ByteRange covers the whole 
document and also found no easy way to do it with existing poppler 
functions/APIs.

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https://bugs.launchpad.net/bugs/1085526

Title:
  ubuntu pdf doc viewer will not let me sign a document

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