For each PDF/A-1 validation issue we try to explain what it means and, if possible how to resolve it. For a more technical explanation of the issue we quote the related section of the ISO 19005-1 PDF/A Specification.
Value "3D" is prohibited for the key <<Subtype>> Value "Caret" is prohibited for the key <<Subtype>> Value "SomePrivateCustomAnnotation" is prohibited for the key <<Subtype>> Value "Watermark" is prohibited for the key <<Subtype>> Value "Polygon" is prohibited for the key <<Subtype>> Value "PolyLine" is prohibited for the key <<Subtype>> Value "Screen" is prohibited for the key <<Subtype>> Value "Redact" is prohibited for the key <<Subtype>> Value "FileAttachment" is prohibited for the key <<Subtype>> Value "Movie" is prohibited for the key <<Subtype>> Value "Sound" is prohibited for the key <<Subtype>>
6.5.2 - ISO 19005-1 PDF/A Specification:
Annotation types not defined in PDF Reference shall not be permitted. Additionally, the FileAttachment, Sound and Movie types shall not be permitted.
NOTE: Support for multimedia content is outside the scope of this part of ISO 19005.