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https://issues.apache.org/jira/browse/PDFBOX-4103?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tilman Hausherr resolved PDFBOX-4103.
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Resolution: Fixed
Thank you, I committed your patch with two minor changes, I moved one method
back to where it was before so that there would be less diff, and I reinstated
the two "instanceof" that you replaced with null checks. We try to use these
"instanceof" checks to avoid ClassCastExceptions coming from bad PDFs.
> Optional Content Groups with same names can't have different visibility
> -----------------------------------------------------------------------
>
> Key: PDFBOX-4103
> URL: https://issues.apache.org/jira/browse/PDFBOX-4103
> Project: PDFBox
> Issue Type: Bug
> Components: PDModel
> Affects Versions: 2.0.8
> Reporter: Ivan Khaldeev
> Assignee: Tilman Hausherr
> Priority: Major
> Labels: OCGs
> Fix For: 2.0.9, 3.0.0 PDFBox
>
> Attachments: check_group_by_object_ref.patch, layers.pdf
>
>
> According to PDF specs, it is possible to create OC Groups with the same
> name. Their visibility should be determined using object references (object
> number and generation number). The current implementation of
> PDOptionalContentProperties does not allow to create and check visibility of
> two different groups with the same name because all checks are done using
> group name, not group object key.
> Provided PDF demonstrates this issue.
> The attached patch adds an ability to use PDOptionalContentGroup as key to
> check and set group visibility.
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