Does AppendPDF support encrypted / secure files? May 6, 2013 / Judi / Appending/Publishing, FAQ, FAQ AppendPDF No. AppendPDF will not work with encrypted or write-protected files. Full permissions on all files and paths are required for AppendPDF to work properly. AppendPDF does have the ability to apply standard Acrobat security to the appended output file. Adobe AcrobatAppendPDFSecurity