When documents are exported to PDF, the creation date and modification date are not expected, or, when the time zone is with negative offset, the documents are invalid (detected by validation tools).
Currently, signature flags, represented by the 'SigFlags' optional entry, are not imported and exported, and there is no API for setting them.
As a result, documents signed with RadPdfProcessing (or with RadPdfViewer) appear in Adobe Reader without the blue document message bar at the top (the analogue of the RadPdfViewer's SignaturePanel).
If the API is supported, setting the flag to 1 or 3 would ensure that the message bar would be visualized in Adobe Reader.
When importing document with predefined ToUnicode CMaps (e.g. Identity-H), an InvalidCastException is thrown with cause: Unable to cast object of type 'Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.Model.Types.PdfName' to type 'Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.Model.Elements.CMaps.ToUnicodeCMap'.
Some customers need to export a single page of the PDF document to plain text. Expose such a possibility so the customers don't need to export the whole document.
Stencil color has to be preserved for images with ImageSource when ImageMask property set to true. Not preserving it results in wrong colors (for instance the image may be visualized as a black rectangle). Available in R1 2019 Official Release Version.
The tj operator is responsible for drawing text content. When such operator is left empty, the import throws NullReferenceException because of the missing operands. Available in LIB Version 2018.3.1022.
This operator modifies the current clipping path by intersecting it with the current path, using the even-odd rule to determine which regions lie inside the clipping path. Available in R3 2018 SP1 release.
This is content stream operator that is used to close, fill and then stroke a PDF path geometry. Available in R3 2018 SP1 release.
This type of fields is currently not supported: https://feedback.telerik.com/Project/184/Feedback/Details/249205 . However, the fields can be skipped and the other content can be imported without throwing an exception. Fix available in R3 2018 SP1 release.
When the string contained in a PdfHexString instance is empty, invoking ToString() leads to IndexOutOfRangeException. Available in R3 2018 SP1 release version.
A font descriptor can be used by several fonts. However, when first a TrueType font is imported, later trying to import a Cid font leads to InvalidCastException with the message: "Unable to cast object of type 'Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.Model.Elements.Fonts.FontDescriptor' to type 'Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.Model.Elements.Fonts.CidFontDescriptor'." Fix available in R3 2018 SP1 release.
The hierarchical document structure is a means to describe the PDF document structure, which is currently not supported. See 10.6.1 Structure Hierarchy on 856 page of the PDF specification for details. This document structure is an alternative to the standard PDF structure and most non-Adobe software does not support it. The document might have been created with Adobe software like Adobe LiveCycle Designer. Very often the document contains some fallback text in the standard PDF structure like: "Please wait... If this message is not eventually replaced by the proper contents of the document, your PDF viewer may not be able to display this type of document." "The document you are trying to load requires Adobe Reader 8 or higher. You may not have the Adobe Reader installed or your viewing environment may not be properly configured to use Adobe Reader. For information on how to install Adobe Reader and configure your viewing environment please see http://www.adobe.com/go/pdf_forms_configure." "For the best experience, open this PDF portfolio in Acrobat X, Reader X, or later."
CMYK color may be set using SCN, scn, K and k operators. Available support for import of CMYK colors in R3 2018 Official Release.
In this case, we should use a default alpha source value which is the opacity source.
The signature field preserves information about the time of signing through the TimeOfSigning property of Signature.Properties. However, the DateTime object doesn't keep info about the time zone the document has been signed in. Some customers need to obtain this information.