I want to create a locked document created by
\special command. The instructions are provided here. By setting
perm as 0x0904 the document can be signed in Acrobat (If there has been a signature region before).
I have found that
digsig package and
eforms package can help me to produce a signature region by loading
pdfLaTeX. The instructions can be refered here. However, both of them do not work in
XeLaTeX, which confuses me a lot (Because I have to create a document by
XeLaTeX). I wonder if there is a method to make them effective in
XeLaTeX? If not, is there a better package to support the digital signature?