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https://issues.apache.org/jira/browse/PDFBOX-3740?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15952570#comment-15952570
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Maruan Sahyoun commented on PDFBOX-3740:
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The main topic about PDF/A is to ensure the PDF can be reproduced visually in a
consistent way, there are no external dependencies which you may not be able to
resolve in the future, there is no protection/encryption you may not be able to
resolve in the future and there is no use of restricted patents. To ensure that
PDF/A restricts or enforces several PDF properties. The PDF/A-1 spec together
with the corrigendum's is a quick read (the spec being approx. 40 pages) which
lists all requirements which were agreed on so you might want to grab a copy
from ISO.
For the OutputIntent
{quote}
All colours, except where used for a thumbnail image (PDF Reference, 8.2.3),
shall be specified in a device-independent manner, either directly by the use
of a device-independent colour space, indirectly through the use of default
colour spaces (PDF Reference 4.5), or indirectly by the use of an OutputIntent.
A conforming file may use any colour space specified in PDF Reference, except
as restricted in 6.2.3.2 to 6.2.3.4.
{quote}
As you can see *device independence* is the key to this requirement as PDF is
not only to represent a document on paper but also on other devices such as
screens.
> Standard 14 and Encoding
> ------------------------
>
> Key: PDFBOX-3740
> URL: https://issues.apache.org/jira/browse/PDFBOX-3740
> Project: PDFBox
> Issue Type: Bug
> Components: Preflight
> Affects Versions: 2.0.5
> Environment: linux
> Reporter: Wolfgang Hamann
> Attachments: test1.pdf, test2.pdf, test3.pdf, test4.pdf
>
>
> before I attempted to become PDF/A compatible, I was happy with just an
> Encoding entry for the standard 14...
> I have made a few tests:
> 1 - full embedding of font
> 2 - just Encoding
> 3 - complete font descriptor
> rendering results and preflight warnings
> gs acro xpdf preflight
> ok ok bad many
> ok ok ok 2
> ok bad ok 1
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