Purpose: Long-term archiving of electronic documents with full semantic structure.

• "A" for Archiving

• Level "1a" ensures:

  • Tagged PDF (with proper logical structure and reading order)

  • Unicode text for proper text extraction and searchability

  • Embedded fonts (for consistent rendering)

• Restrictions:

  • No audio/video

  • No encryption

  • No JavaScript

  • No external content (everything must be self-contained)

• Based on: PDF 1.4 (Acrobat 5)

PdfProcessing: ArgumentException is thrown when importing a document with a duplicated filed names.

Wrong clipping order when exporting a document with MarkedContent leads to a missing content.

A shading dictionary specifies details of a particular gradient fill, including the
type of shading to be used, the geometry of the area to be shaded, and the geometry of the gradient fill. Various shading types are available, depending on the value of the dictionary’s ShadingType entry:

• Coons patch meshes (type 6) construct a shading from one or more color
  patches, each bounded by four cubic Bézier curves.

This error happens when importing a document.

Error message: 

System.InvalidCastException: 'Unable to cast object of type 'Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.Model.Elements.Forms.FormFieldsTree' to type 'Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.Model.Types.PdfArray'.'

Error message:

System.InvalidCastException: 'Unable to cast object of type 'Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.Model.Types.PdfArray' to type 'Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.Model.Elements.Functions.FunctionObject'.'

Multiple graphic state objects are lost on import.

When importing a document with a missing "endobj" operator, an exception is thrown: InvalidCastException: 'Unable to cast object of type 'Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.Model.Types.PdfInt' to type 'Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.Model.Types.IndirectObject'.'

InvalidCastException is thrown due to incorrectly parsed stream dictionary.

ArgumentOutOfRangeException is thrown when creating a CapPathRound for an SVG element.

Exporting a specific PDF file generates large amounts of ExtGState entries, which results in large file sizes.

When exporting the PDF content to plain text, the form fields and their values are not extracted. It would be nice to have an option to include the content in the form fields as well.

InvalidCastException is thrown when importing a document with an annotation declared in the Fields collection.

I have a simple program that imports a PDF, calls AcroForm.FlattenFormFields(), and calls Export() on the PdfFormatProvider. I am seeing the following exception during Import() on a signed W9 form a customer has uploaded into our system. Due to the sensitive nature of the document I cannot upload it, but below is the Sig section. I have tried other example signed PDFs which seem to work fine (See attached)

39 0 obj
<< /Type /Annot /Rotate 0 /AP 180 0 R /Rect [ 105.8515 149.2023 289.4443 261.1185
] /Border [ 0 0 0 ] /M (h<D[×¥\001.ƒ¶AB}«\006iÚ¿E@\024_”W±ÔÃ\030ÙL\020"É]a\012Ú6¡0\000¶Žm1@Ž)
/C [ 1 ] /DA (h<D[×¥\001.ƒ¶AB}«\006.\023âø‰\035\005íöu\002ÊÒ½ùwË@—‹måÿڏ[ ‹í!¨\001)
/F 4 /Subtype /Sig >>
endobj

 

Exception

System.NotSupportedException: 'Import of annotation with type Sig is not supported.'

Stack Trace

at Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.Model.Elements.Annotations.AnnotationFactory.CreateUnsupportedAnnotationObject(PdfName type)
   at Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.Model.Converters.TypeAwareConverter`1.CreateInstance(Type type, PostScriptReader reader, IPdfImportContext context, PdfDictionary dictionary)
   at Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.Model.Converters.Converter.ConvertFromDictionary(Type type, PostScriptReader reader, IPdfImportContext context, PdfDictionary dictionary)
   at Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.Model.Converters.Converter.Convert(Type type, PostScriptReader reader, IPdfImportContext context, IPdfPrimitive value)
   at Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.Model.Converters.Converter.Convert(Type type, PostScriptReader reader, IPdfImportContext context, IPdfPrimitive value)
   at Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.Model.Types.PdfCollectionBase`1.ConvertElementToType[T](PostScriptReader reader, IPdfImportContext context, IPdfPrimitive element)
   at Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.Model.Types.PdfCollectionBase`1.TryGetElement[T](PostScriptReader reader, IPdfImportContext context, TIndex index, T& element)
   at Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.Model.Elements.DocumentStructure.Page.<>c__DisplayClass21_0.<CopyPageAnnotationsTo>b__0()
   at Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.ExceptionHandling.ExecutionHandler.TryHandleExecution[E](Action operation)

 

 

I have a simple program that imports a PDF, calls AcroForm.FlattenFormFields(), and calls Export() on the PdfFormatProvider. With the attached example PDF I am seeing the following exception.

System.NotImplementedException: 'The method or operation is not implemented.'

Stack Trace

at Telerik.Windows.Documents.Core.Fonts.Type1.Type1Format.Type1FontSource.GetCapHeight()
   at Telerik.Windows.Documents.Core.Fonts.FontSource.get_CapHeight()
   at Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.Model.Elements.Fonts.FontDescriptor.CopyRequiredButType3FontPropertiesFrom(FontBase font)
   at Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.Model.Elements.Fonts.FontDescriptor.CopyPropertiesFrom(IPdfExportContext context, FontBase font)
   at Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.Model.Elements.Fonts.SimpleFontObject.CopyPropertiesFromOverride(IPdfExportContext context, FontBase font)
   at Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.Export.PdfExporter.WriteFontsFromContext(PdfWriter writer, IPdfExportContext context)
   at Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.Export.PdfExporter.Export(IRadFixedDocumentExportContext context, Stream output)
   at Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.ExceptionHandling.ExecutionHandler.TryHandleExecution[E](Action operation)
   at Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.PdfFormatProvider.ExportOverride(RadFixedDocument document, Stream output)

Introduce Sanitize Document functionality.

https://experienceleague.adobe.com/en/docs/document-cloud-learn/acrobat-learning/advanced-tasks/redact
https://helpx.adobe.com/acrobat/using/removing-sensitive-content-pdfs.html

Handle the import of documents with Associated Files (/AF) elements whose content is set to null.

Handle the import of documents with null elements in the Associated Files (/AF) collection.

The PDF/A-1 standard uses the PDF Reference 1.4 and specifies two levels of compliance:

- PDF/A-1b - Its goal is to ensure reliable reproduction of the visual appearance of the document.

- PDF/A-1a - Its objective is to ensure that documents content can be searched and re-purposed. This compliance level has some additional requirements:

• Document structure must be included.
• Tagged PDF.
• Unicode character maps
• Language specification.

Since the PdfProcessing and its PdfFormatProvider is compliant with the PDF Reference 1.7. , the produced documents are created with this version as well: