I've added some more metadata into trunk that makes us more compliant.
The current output from http://www.pdf-tools.com/pdf/validate-pdfa-
online.aspx is:

Validating file "test.pdf" for conformance level pdfa-1a
The key StructTreeRoot is required but missing.
A device-specific color space (DeviceRGB) without an appropriate output intent 
is used.
The document does not conform to the requested standard.
The document contains device-specific color spaces.
The document doesn't provide appropriate logical structure information.
Done.

** Also affects: simple-scan (Ubuntu)
   Importance: Undecided
       Status: New

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You received this bug notification because you are a member of Desktop
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https://bugs.launchpad.net/bugs/1640607

Title:
  Generate PDF/A compliant documents

Status in Simple Scan:
  Triaged
Status in simple-scan package in Ubuntu:
  New

Bug description:
  [Impact]
  PDF/A [1] is a standard for PDF documents to make them suitable for 
archiving. The PDF files that simple-scan produces are PDF compliant, but 
missing some optional fields that are required for PDF/A.

  [Test Case]
  1. Scan a document
  2. Save to a PDF file
  3. Check document through a PDF validator (e.g. [2])

  Expected result:
  The generated document is compliant with PDF/A

  Observed result:
  The document is not compliant.

  [Regression potential]
  Some risk of PDF changes making files saved from Simple Scan not viewable in 
a PDF reader. This seems very low as PDF/A is a very commonly used standard.

  [1] https://en.wikipedia.org/wiki/PDF/A
  [2] http://www.pdf-tools.com/pdf/validate-pdfa-online.aspx

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