Encrypt a PDF File:
Add a User (Open) Password and/or an Owner (Restrictions) Password,
Set the Owner Pasport Restrictions:
NOTE 1: There are two PDF password types - user (open) password and owner (restrictions) password. The user password (also called open password) protects a PDF file from opening. The owner (restrictions) password sets certain restrictions (to protect a PDF file from printing, inserting, deleting, and extracting pages, entering form data, signing, creating template pages, etc.). A PDF file may either be not encrypted at all or encrypted either only by a user (open) password, only by an owner (restrictions) password, or by both passwords.
NOTE 2: If there is either a user (open) password or an owner (restrictions) password, then the file is encrypted, then page extraction is not allowed (even if there are no other restrictions).
NOTE 5: The algorithm of this operation will detect and mark by a corresponding error message any input file that:
NOTE 6: The algorithm of this operation will accept and successfully process any file (other than listed above), even if the file:
- has not been successfully uploaded, or
- has a non-PDF extension, or
- has the PDF extension but a non-PDF structure, or
- is a corrupted PDF, or
- is a PDF already encrypted by an owner (restrictions) password, or
- is a PDF already encrypted by a user (open) password.
NOTE 7: The algorithm of this operation will detect and mark by a corresponding error message a missed password.
- is a PDF with a static XFA structure, or
- is a PDF with a dynamic XFA structure.
NOTE 8: The algorithm of this operation will detect and mark by a corresponding error message any contradictory combination of restrictions.
NOTE 9: XFA vs PDF: PDF File Type vs PDF File Extension.
NOTE 10: Error Message: "To view the full contents of this document, you need ..."
NOTE 11: Error Message: "Please wait... If this message is not eventually replaced ..."
NOTE 12: How to Download Your Output Files.
NOTE 13: Your Privacy: Deleting Your Output Files.
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