Ivan Khaldeev created PDFBOX-4103:
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Summary: 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
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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