For complex scripts, the font must be embedded in the PDF document. Currently, complex scripts are supported in text fields, signature fields, list boxes, and combo boxes. Complex scripts are also supported by de::softpro::doc::SignDocDocument::addText() and de::softpro::doc::SignDocDocument::addWatermark() but not by de::softpro::doc::SignDocDocument::addTextRect() and for FreeText annotations.
When adding text using complex scripts, the font used for the text must either
For the latter case, you need a font configuration, see Font Configuration.
1.7.2