[EN] Document contains encrypted data [PDF/X-4]

Description 

The file contains encrypted data (a data stream uses the Crypt filter entry).

This Preflight message indicates that the PDF file contains encrypted content. This means certain parts of the document (such as text, images, metadata, or attachments) are protected by a password or encryption algorithm.

PDF encryption is commonly used to:

• Implement access controls (e.g., password required to open)

• Restrict editing or printing permissions

• Protect sensitive information, such as personal data or trade secrets

Encrypted PDFs are not compatible with all standards, especially PDF/A or PDF/X, which require long-term archiving or print reproducibility.

Common Causes

• Password protection: The document is secured with a user or owner password.

• Restricted permissions: PDF settings prevent copying, printing, or editing.

• Digital signatures: Certain signatures use encryption to protect integrity.

• Automated encryption: Company policies or cloud services may automatically encrypt documents.

• Embedded encrypted files: Attachments or embedded content may be encrypted separately, even if the main document is not.

• PDF export from Office software: Some programs may inadvertently enable encryption during export.

Suggested Solutions

• Remove encryption in Adobe Acrobat Pro: Open the PDF in Acrobat Pro. Go to File > Properties > Security. Set the security method to No Security. Enter the password if required. Save the file under a new name.

• Re-export from the original file without encryption: Open the source file (e.g., Word, InDesign). Export the PDF again, ensuring that password protection or security options are disabled.

• Convert to PDF/A (automatic encryption removal): Open the PDF in Acrobat. Select File > Save As > PDF/A. Acrobat will remove encryption automatically, as PDF/A does not allow encrypted data. Afterwards, the file can be converted to PDF/X format if needed.

Important notes on security and legality

• Legal considerations: Removing encryption without authorization may violate privacy or copyright laws.

• Data integrity: After removing encryption, verify that no data was corrupted.

• Company policies: Consult IT before decrypting internal or sensitive documents.