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.

Additional checks in the Preflight tool.

Analyzing documents with the Preflight tool.Automating document analysis with droplets or preflight actions.Correcting problem areas with the Preflight tool.Viewing preflight results, objects, and resources.PDF/X-, PDF/A-, and PDF/E-compliant files.Playing video, audio, and multimedia formats in PDFs.Add audio, video, and interactive objects to PDFs.Edit document structure with the Content and Tags panels.Reading PDFs with reflow and accessibility features.Capture your signature on mobile and use it everywhere.Overview of security in Acrobat and PDFs.Securing PDFs with Adobe Experience Manager.Convert or export PDFs to other file formats.Hosting shared reviews on SharePoint or Office 365 sites.Working with component files in a PDF Portfolio.Add headers, footers, and Bates numbering to PDFs.Send PDF forms to recipients using email or an internal server.Troubleshoot scanner issues when scanning using Acrobat.Change the default font for adding text.Enhance document photos captured using a mobile camera.Rotate, move, delete, and renumber PDF pages.Asian, Cyrillic, and right-to-left text in PDFs.Grids, guides, and measurements in PDFs.Access Acrobat from desktop, mobile, web.

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