Excuse me, how to make the PDF can not be any editing software, the unit of issuance of the report will use the system automatically converted to PDF file, but the current PDF report can edit, afraid of tampering after customer reach, so request to use any way to PDF is encrypted, available for customers to browse on the Internet,

CodePudding user response:

Add a signature to a file or a hash code, as long as someone else a modify your signature or hash code is automatically invalidated

CodePudding user response:

Can consider what download file md5

CodePudding user response:

Foxit Reader, download file open and then click the print, and then in the name of the place, choose Foxit Reader PDF Printer, one line below the choice: as image printing, finally click ok to print, will pop up a dialog box, click save, save is not to edit,