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In the Signatures panel, select and expand the signature, and choose View Signed Version from the Option menu. The previous version opens in a new PDF, with the version information and the name of the signer in the title bar.

To return to the original document, choose the document name from the Window menu. After a document is signed, you can display a list of the changes made to the document after the last version. End users often exchange certificates as needed when using certificate security. Alternatively, they add certificates directly from signatures in signed documents and then set trust levels. However, enterprises often require employees to validate the signatures of others without performing any manual task.

Acrobat trusts all certificates for signing and certifying that chain up to a trust anchor. Therefore, administrators should preconfigure client installations or let their end users add a trust anchor or anchors. For more information on trusting certificates, see About certificate-based signatures. Digital signatures that were added using a self-signed certificate cannot be automatically validated by Adobe as the certificate is not in the list of Trusted Identities that Adobe uses to validate signatures.

A self-signed certificate is a certificate that you have generated yourself using a third-party application. If you open such a PDF, you will see a warning At least one signature has problems. For security reasons, Adobe does not recommend adding a self-signed certificate, or any random certificate to the Adobe's list of Trusted Identities.

Click OK in the trust settings pop-up dialog, and then click OK. Once you sign the PDF Portfolio as a whole, you cannot add signatures to the component documents. However, you can add more signatures to the cover sheet. You can add signatures to attachments before signing the cover sheet.

Right-click the attachment, and choose Open File from the context menu. To view signatures on the PDF Portfolio , navigate to the cover sheet to view the document message bar and signatures pane. The most significant signature appears in a Signature Badge in the toolbar. Details of all signatures appear in the cover sheet. To view the name of the organization or person that signed the PDF Portfolio , hover the pointer over the Signature Badge.

To view details about the signature that appears in the Signature Badge , click the Signature Badge. The cover sheet and the Signatures pane on the left open with details.

To view an explanation of the problem, hover the pointer over a Signature Badge with a warning icon. Different warning icons appear for different situations. For a list and explanation of each warning, see the DigSig Admin Guide at www. The form author provides XML signing, validating, or clearing instructions for form events, such as button click, file save, or submit. Like PDF digital signatures, XML digital signatures ensure integrity, authentication, and non-repudiation in documents. However, PDF signatures have multiple data verification states.

Some states are called when a user alters the PDF-signed content. In contrast, XML signatures only have two data verification states, valid and invalid. The invalid state is called when a user alters the XML-signed content. Long-term signature validation allows you to check the validity of a signature long after the document was signed. To achieve long-term validation, all the required elements for signature validation must be embedded in the signed PDF.

Embedding these elements can occur when the document is signed, or after signature creation. Without certain information added to the PDF, a signature can be validated for only a limited time. This limitation occurs because certificates related to the signature eventually expire or are revoked. Once a certificate expires, the issuing authority is no longer responsible for providing revocation status on that certificate.

Without conforming revocation status, the signature cannot be validated. The required elements for establishing the validity of a signature include the signing certificate chain, certificate revocation status, and possibly a timestamp. If the required elements are available and embedded during signing, the signature can be validated requiring external resources for validation.

Acrobat and Reader can embed the required elements, if the elements are available. Embedding timestamp information requires an appropriately configured timestamp server. CDS certificates can add verification information, such as revocation and timestamp into the document without requiring any configuration from the signer.

However, the signer must be online to fetch the appropriate information. This preference is selected by default. If all the elements of the certificate chain are available, the information is added to the PDF automatically.

If a timestamp server has been configured, the timestamp is also added. In some workflows, signature validation information is unavailable at signing, but can be obtained later. For example, a company official may sign a contract using a laptop while traveling by air. The computer cannot communicate with the Internet to obtain timestamping and revocation information to add to the signature.

When Internet access is available later, anyone who validates the signature can add this information to the PDF. All subsequent signature validations can also use this information.

Ensure that your computer can connect to the appropriate network resources, and then right-click the signature in the PDF. For more information, see blogs. The command is unavailable if the signature is invalid, or is signed with a self-signed certificate. The command is also unavailable in case the verification time equals the current time.

Legal Notices Online Privacy Policy. User Guide Cancel. Setting up digital signature validation. Set signature verification preferences. Open the Preferences dialog box. For Verification , click More.

Select verification options as needed and click OK. Verification Behavior. Verification Time. Windows Integration. Specify whether to trust all root certificates in the Windows Certificates Store for: Validating signatures: Certificates are trusted for approval signature validation.

Validating certified documents: Certificates are trusted for certification signature validation. Selecting these options can compromise security. Click OK. Once you've ensured that you have the latest version of Office , you can activate the Adobe Acrobat add-in by navigating to its. From the right-click menu, right-click the Word program, and click Run as administrator. Another way to get the Adobe Acrobat tab to appear is by updating the registry.

If you've successfully added the Adobe Acrobat add-in by navigating to its. Change the LoadBehavior key value to 3. The Adobe Acrobat tab should appear the next time you open Word or another Office program. Need more help? Expand your skills. Get new features first. Was this information helpful? Yes No.

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