How to Fix Acrobat DC Saying a Commented PDF Is Signed and Cannot Be Opened
Question details
The user is unable to open or edit a commented PDF in Acrobat DC because the software reports the file as signed or locked.
- Product
- Adobe Acrobat DC
- Device & OS
- not provided
- Scenario
- Opening a PDF that was previously created, Reader-enabled, or commented on in an older version of Acrobat.
- Observed behavior
- Acrobat DC restricts file access and editing, stating the document is signed or locked, even though the user did not intentionally apply a digital signature.
Verify whether the PDF document was originally created with 'Reader-enabled' rights, as editing these specific files in newer software versions can invalidate their usage permissions and trigger unexpected security warnings.
Request an Editable, Non-Reader-Enabled Source PDF
The most reliable way to bypass this error is to obtain a version of the PDF that has not been restricted or Reader-enabled by the original author.
Reader-enabled PDFs contain special usage rights designed to let standard readers fill forms or add comments. Modifying these files in advanced editors like Acrobat DC can break the enabling features, causing the software to lock the file to protect it from malicious content.
Determine the original creator or publisher of the PDF document you are trying to open.
Reach out to the author and explain that the current Reader-enabled format is triggering a signed or locked error when opened in newer PDF editors.
Ask the publisher to export and provide a standard, editable copy of the PDF without any usage rights, certifications, or security restrictions applied.
Save a Copy via Print to PDF
If you only need to view the content or make minor adjustments without editing the original interactive elements, saving a flattened copy can bypass the signature restriction.
Open and Edit PDFs Seamlessly with WPS Office
Avoid complex 'Reader-enabled' restrictions and unexpected locked file errors by using WPS Office. Its powerful built-in PDF editor lets you view, comment, and edit PDF documents smoothly without triggering legacy software conflicts.
- 1. Install WPS Office: Download and install WPS Office for free from the official website.
- 2. Open the PDF tool: Launch WPS Office and click on 'Open' in the left sidebar to browse for your document.
- 3. Load the document: Select the problematic PDF file to open it directly in the WPS PDF editor.
- 4. Edit and comment: Use the 'Comment' or 'Edit' tabs at the top to seamlessly modify the document without unexpected security pop-ups.
Frequently Asked Questions
What does it mean when a PDF is Reader-enabled?
A Reader-enabled PDF is a file saved with special usage rights, allowing users with a standard PDF reader to add comments, fill forms, or sign the document. Modifying it in certain advanced editors can invalidate these rights and trigger a document lock.
Why did my comments cause the PDF to become signed or locked?
If the document was originally Reader-enabled or certified, adding comments in an older version of the software might interact poorly with the newer security checks in Acrobat DC, causing it to incorrectly register the file as signed and locked to prevent further unauthorized modifications.
Can I remove the digital signature from the PDF myself?
If the signature or certification was applied by the author to restrict editing, you cannot remove it directly without the original password or author's permission. Your best option is to request an unrestricted version directly from the creator.
