![]() Have you tried signing any other PDF? If not, please try and see if this issue is reproducible. Navigate to PDF's Properties from File>Properties>Security>under Document Restrictions Summary, check if the signing is allowed? What is the current dot version of Adobe Reader installed, to identify refer to Identify the product and its version for Acrobat and Reader DC Try signing the PDF through the URL on a browser like Chrome or Firefox or Safari and check if you still get the error message. Is it a PDF form or a PDF with text? Is it possible to share the screenshot of the error you get? To share the screenshot, please refer to Are you trying to use Adobe Fill and Sign feature or trying to sign the PDF using Digital ID/Certificate based signatures? ![]() Selecting a region changes the language and/or content on 're sorry for the trouble you had while signing the PDF. The PDF creator must enable usage rights for Reader users ( File > Save As Other > Reader Extended PDF). Acrobat and Reader can embed the required elements, if the elements are available. If the required elements are available and embedded during signing, the signature can be validated requiring external resources for validation. The required elements for establishing the validity of a signature include the signing certificate chain, certificate revocation status, and possibly a timestamp. Without conforming revocation status, the signature cannot be validated. Once a certificate expires, the issuing authority is no longer responsible for providing revocation status on that certificate. This limitation occurs because certificates related to the signature eventually expire or are revoked. Without certain information added to the PDF, a signature can be validated for only a limited time. Embedding these elements can occur when the document is signed, or after signature creation. To achieve long-term validation, all the required elements for signature validation must be embedded in the signed PDF. Long-term signature validation allows you to check the validity of a signature long after the document was signed.
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