The feature will be available in our official release 2015 Q2. 

Transparency is not shown when we add png images.

The feature will be available in our official release Q1 2016.

Please add a link to the new TDP library and explain it, so people can find the place to vote for PDFProcessing!
http://feedback.telerik.com/Project/184/Feedback

According to http://www.digitalpreservation.gov/formats/fdd/fdd000251.shtml#sign there should be two elements in the XMP-metadata to indicate the PDF/A conformance level.

Here is an example:
<rdf:Description rdf:about="" xmlns:pdfaid="http://www.aiim.org/pdfa/ns/id/">
  <pdfaid:part>1</pdfaid:part>
  <pdfaid:conformance>B</pdfaid:conformance>
</rdf:Description>

or attribute version:

<rdf:Description rdf:about="" xmlns:pdfaid="http://www.aiim.org/pdfa/ns/id/" pdfaid:part="1" pdfaid:conformance="B" />

See also http://www.pdfa.org/wp-content/uploads/2011/08/tn0008_predefined_xmp_properties_in_pdfa-1_2008-03-20.pdf

and http://www.aiim.org/documents/standards/PDF-A/ISO19005AppNotes.pdf

The feature will be available in our official release 2015 Q2.

The feature will be available in our official release 2015 Q2.

Currently RadPdfProcessing imports Contents only from stream. In some documents Contents property may be PdfArray. 

Provide a way to convert flow formats (docx, HTML, RTF) to PDF.

Declined because the issue is originally caused by Form XObject missing functionality. You may subscribe for the following feedback item instead: http://feedback.telerik.com/Project/184/Feedback/Details/190108-implement-import-of-form-xobjects

The feature will be available in our official release Q1 2016.

When encryption is enabled, the streams inside the PDF document are encrypted individually. If the encrypted result contains '{' or '}' symbols, FormatException ("Input string was not in a correct format.") is thrown.

An InvalidCastException is thrown when reading the Trailer.

The fix will be available in our latest LIB release (v. 2015.02.0810).