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https://issues.apache.org/jira/browse/PDFBOX-2765?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14550351#comment-14550351
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Tilman Hausherr commented on PDFBOX-2765:
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There was a comment by [~leonardr] that was only in the mailing list so I'm
adding it here:
{quote}
As the expression goes - “here there be dragons”.
You CANNOT reliably hash individual PDF objects with the expectation of
comparison, because there is no canonicalization or serialization standard for
PDF objects. You can have objects that are 100% equivalent BUT are not
equal/identical. This is a blessing and a curse with respect to PDF and its’
one of the main reasons that “object-level encryption and signing” was removed
from PDF 1.7 on the way to ISO 32000-1 - because no one (incl. Adobe) was able
to implement it reliably.
{quote}
> Add method to subset fonts for document pre-save
> ------------------------------------------------
>
> Key: PDFBOX-2765
> URL: https://issues.apache.org/jira/browse/PDFBOX-2765
> Project: PDFBox
> Issue Type: New Feature
> Components: Writing
> Affects Versions: 2.0.0
> Reporter: Jesse Long
> Assignee: John Hewson
> Priority: Minor
>
> I have a custom COSWriter which compresses all streams and runs a SHA1 sum
> over each object, only writing one instance of each object with the same SHA1
> sum.
> This really helps compress PDFs.
> I use this by calling MyCustomCOSWriter.write(PDDocument);
> The trouble is that I have no way of calling the font subsetting that happens
> in PDDocument.save().
> Could we have a method to perform that font subsetting manually?
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