The PDF specification states that the fonts should be embedded in the document for it to be valid. In those cases complex unicode characters are properly shown when the document is shown in RadPdfViewer. Otherwise the result is implementation dependent and some documents might not be properly shown.
Additionally, some predefined CMAP files should be present in the PDF file to assure the correct rendering of files. The only thing to do in order to display Chinese characters in RadPdfViewer is to provide an embedded CMAP that describes the transformation from charID to unicode character. For example, if you export Chinese text from MS Word, there should not be a problem with the way RadPdfViewer displays it.
As to removing a font, I am not quite sure what you mean, could you please elaborate a bit on the desired result?
I'm looking forward to your reply.
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