UseHexEncoding property (Secure PDF writer)
public bool UseHexEncoding
This property specifies the format that will be used to write text strings, such as AuthorName, Location, ContactInfo to the signature object in the document. If it is set to true, the strings will be written in hexadecimal encoding (and in binary encoding otherwise). It is recommended to set this property to true if the above strings contain non-ASCII characters or store data in Unicode.