I have set up PDF Stamping, but my PDF downloads are unstamped

These are the most common problems that would cause PDF Stamping to fail:

• Make sure you have actually set up PDF Stamping for your product according to our instructions—uploaded PDFs do not just automatically issue Stamped downloads unless the product is properly configured for PDF Stamping;
• If the original PDF you uploaded was locked with a password:
  • Make sure you provide that password in the product's PDF Stamping settings;
  • Provide the original file's Master password if it has one, or use the User (read-only) password if it only has that without any Master password;
  • Make sure the file's password compatibility option has been set to "Acrobat 7.0 And Later" (PDF v1.6) or lower, not "Acrobat X And Later" (PDF v1.7) nor higher;
  • Consider uploading an unlocked file, since we add a randomized Master password to every Stamped copy anyway, and you can optionally specify a User (read-only) password in the product's PDF Stamping settings if you wish.
• If the PDF you uploaded is larger than about 100 MB, or if you are finding that the initial download immediately after checkout is unstamped, yet later downloads on the same link are Stamped, please see this help page.

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