Set the trust level of a certificate

In Acrobat or Reader, the signature of a certified or signed document is valid if you and the signer have a trust relationship. The trust level of the certificate indicates which actions you trust the signer for.

You can change the trust settings of certificates to allow or disallow specific actions. For example, you can change the settings to enable the dynamic content and embedded JavaScript within the certified document.

For more information, see Digital Signature User Guide for Adobe Acrobat and Adobe Reader (PDF) at www.adobe.com/go/learn_acr_security_en.

  1. Do one of the following:
    • In Acrobat, choose Advanced > Manage Trusted Identities.

    • In Reader, choose Document > Manage Trusted Identities.

  2. Select a contact, and click Details.
  3. Select the certificate name, and click Edit Trust.
  4. In the Trust tab, select any of the following items to trust this certificate for:
    Use This Certificate As A Trusted Root
    Trusts signatures created directly by this certificate. The root certificate is the originating authority in a chain of certificate authorities that issued the certificate. By trusting the root certificate, you trust all certificates issued by that certificate authority.

    Signed Documents Or Data
    Acknowledges the identity of the signer.

    Certified Documents
    Trusts documents in which the author has certified the document with a signature. You trust the signer for certifying documents, and you accept actions that the certified document takes.

    When Certified Documents is selected, the following options are available:

    Dynamic Content
    Allows movies, sound, and other dynamic elements to play in a certified document.

    Embedded High Privilege JavaScript
    Allows privileged JavaScript embedded in PDF files to run. JavaScript files can be used in malicious ways. It is prudent to select this option only when necessary on certificates you trust.

    Privileged System Operations
    Allows documents to use system operations, such as networking, printing, and file access.

    Note: Only allow Embedded High Privilege JavaScript and Privileged System Operations for sources who you trust and work with closely, such as your employer or service provider.
  5. Click OK twice, and then click Close.