When exporting a document referencing PdfProcessing`s .NET Standard assemblies with PdfComplianceLevel set an exception is thrown.

The common annotation properties are described in table "Entries common to all annotation dictionaries" of the Pdf specification.

Declined: Handling a partial annotation import-export could lead to exporting invalid PDF documents.

According to the PDF Specification: A redaction annotation (PDF 1.7) identifies content that is intended to be removed from the document.

There are two possible options to workaround this functionality:

1. To iterate the document content and replace the matches which meet certain conditions with an empty string:

   foreach (RadFixedPage page in document.Pages)
   {
   	foreach (ContentElementBase elementBase in page.Content)
   	{
   		if (elementBase is TextFragment textFragment)
   		{
   			if (IsValidEmail(textFragment.Text))
   			{
   				textFragment.Text = string.Empty;
   			}
   		}
   	}
   }

   Note: the desired content could be split into several text fragments and if so a custom parser should be created.
   
2. To iterate the document content and check if the TextFragment position is within a specific RectangleGeometry: 
   

   foreach (RadFixedPage page in document.Pages)
   {
   	foreach (ContentElementBase elementBase in page.Content)
   	{
   		if (elementBase is TextFragment textFragment)
   		{
   			if (IsIntersecting(rectangleGeometry, textFragment))
   			{
   				textFragment.Text = string.Empty;
   			}
   		}
   	}
   }

   Note: it should be taken into account that the text fragment could flow out of the rectangle.

When importing a document containing a CIDFont with default width (DW) set as PdfReal (double) an exception is thrown: System.InvalidCastException: 'Unable to cast object of type 'Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.Model.Types.PdfReal' to type 'Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.Model.Types.PdfInt'.'

44 0 obj
<< /BaseFont /NotoSansMono-Medium /CIDSystemInfo << ... >> /CIDToGIDMap /Identity /DW 600.00000 ... /Subtype /CIDFontType2 /Type /Font >>
endobj

According to the PDF Specification: DW - integer - (Optional) The default width for glyphs in the CIDFont. Default value: 1000.

According to the Pdf Specification: A given object number must not have an entry in more than one subsection within a single section.

The object on line 7 has object number 2, the same as of object on line 5.

When exporting a specific document with a CIDFontType0 font (Korean TAWBUL+HGGGothicssiP80g or BPRSCV+HGGGothicssiP60g) the document is wrongly exported which leads to missing content.

Workaround:
After import you can change the font:

pdfDocument = provider.Import(memory);

FontBase malgunGothicFont;
FontsRepository.TryCreateFont(new FontFamily("Malgun Gothic"), out malgunGothicFont);

foreach (RadFixedPage page in pdfDocument.Pages)
{
	foreach (ContentElementBase element in page.Content)
	{
		TextFragment textFragment = element as TextFragment;
		if (textFragment != null && (textFragment.Font.Name == "TAWBUL+HGGGothicssiP80g" || textFragment.Font.Name == "BPRSCV+HGGGothicssiP60g"))
		{
			textFragment.Font = malgunGothicFont;
		}
	}
}