When I try to sign a pdf file, using pdfforge, method SignPdfFile eraises an error "Append mode does not support changing the encryption status". The pdf file was create by pdfcreator itself. Signpdffile uses a reference to PDFEncryptor object, in the .vbs script this reference is set to nothing, but in my development language, vfp, the equivalent NULL value so I try to set this encyptor object as equal as the original pdf file, but the error is the same.
Please help, and thanks in advance.
PD: Version of pdfforge, distributed with pdfcreator 1.0.1.