The PDF is password-protected
KDP cannot open an encrypted interior. It is rejected without the rest of the file being read.
Last reviewed
Why KDP cannot use a protected file
A print workflow needs to open, read and re-process your PDF: to check it, to impose it onto press sheets, and to render it. Encryption stops that. A file with a password to open it obviously cannot be read; less obviously, a file with no open password but with restrictions on printing, editing or copying is also encrypted, and print systems treat it the same way.
Where the protection comes from
Most often from an export dialog. Word's “Restrict editing”, Acrobat's “Protect” tools, and some online converters apply permissions by default. Files received from a designer or formatter may also arrive protected, as a way of discouraging changes.
Removing it
The clean fix is to export again from the source document with security set to none. If you only have the PDF, open it in a PDF editor with the permissions password and remove security, or ask whoever made it for an unprotected copy.
Printing to a new PDF through a print driver often produces an unencrypted file, but it can also flatten text to images, drop embedded fonts or change page size. Check the result in the pre-flight checker before uploading: it reports encryption as its own error, separately from everything else.
Protecting your work without encryption
Authors sometimes add protection to stop a printer or a reader copying the book. Encryption does not do that in print — the printed book is the copy — and for the upload it only gets in the way. Your rights in the text come from copyright, not from a PDF setting.
If you want to deter copying of an eBook edition, that is handled separately, through the digital rights management option KDP offers when you publish a Kindle eBook. It has no bearing on the print interior, which should always be uploaded without security.
What to do
- Security applies even when there is no open password: a permissions restriction on printing or copying is still encryption.
- Word, Acrobat and most export dialogs put this behind a “protect” or “restrict editing” option. Turn it off and export again.
- Re-saving an encrypted PDF through a print-to-PDF driver usually strips it, but check the result rather than assuming.
- The pre-flight checker reports encryption as its own error, so you can confirm the new export before uploading it.
Check for encryption — the tool in this app that settles it.