Updates signature validity checks to match the current version of Adobe Acrobat.
Features
- Updated signature validity checks to match the current version of Adobe Acrobat.
- You can now block "shadow attacks" on signatures.
- Added new 'PDFImage.isIndexed()' and 'PDFImage.getTransparency()' methods.
- Adjusted the loading process to match Acrobat's behavior, and to better handle some deliberately corrupted documents from the Safedocs corporation.
- You can now identify a "billion laughs" type-error with page resources and fail early.
- When creating a PDFImage from a source image with transparency, where possible use a PDF/A-1 friendly "Mask" rather than a "SMask".