Adobe 22020737 Acrobat X Pro Manual - Page 233

USING ACROBAT X PRO 227 Security 2 Your options vary depending on the type of password security attached to the document: • If the document only had Document Open password, click OK to remove it from the document. • If the document had a permissions password, type it in the Enter Password box, and then click OK. Click OK again to confirm the action. Securing documents with certificates Certificate security Use certificates to encrypt documents and to verify a digital signature. A digital signature assures recipients that the document came from you. Encryption ensures that only the intended recipient can view the contents. A certificate stores the public key component of a digital ID. For more information about digital IDs, see "Digital IDs" on page 238. When you secure a PDF using a certificate, you specify the recipients and define the file access level for each recipient or group. For example, you can allow one group to sign and fill forms and another to edit text or remove pages. You can choose certificates from your list of trusted identities, files on disk, LDAP server, or the Windows certificate store (Windows only). Always include your certificate in the recipient list so that you can open the document later. Note: If possible, encrypt documents using certificates from third-party digital IDs. If the certificate is lost or stolen, the issuing authority can replace it. If a self-signed digital ID is deleted, all PDFs that were encrypted using the certificate from that ID are inaccessible forever. Encrypt a PDF or PDF Portfolio with a certificate To encrypt many PDFs, use Action Wizard (File > Action Wizard) to apply a predefined sequence. Alternatively, edit a sequence to add the security features you want. You can also save your certificate settings as a security policy and reuse it to encrypt PDFs. Note: For PDF Portfolios, Action Wizard applies security to the component PDFs but not to the PDF Portfolio itself. To secure the entire PDF Portfolio, apply security to the portfolio's cover sheet. 1 For a single PDF or a component PDF in a PDF Portfolio, open the PDF. For a PDF Portfolio, open the PDF Portfolio and choose View > Portfolio > Cover Sheet. 2 Choose Tools > Protection > Encrypt > Encrypt with Certificate. If you don't see the Protection panel, see the instructions for adding panels at "Task panes" on page 9. 3 At the prompt, click Yes. 4 In the Certificate Security Settings dialog box, select the document components to encrypt. 5 From the Encryption Algorithm menu, choose a rate of encryption, and then click Next. The encryption algorithm and key size are version-specific. Recipients must have the corresponding version (or later) of Acrobat or Reader to decrypt and read the document. • If you select 128-bit AES, recipients must have Acrobat 7 or later or Reader 7 or later to open the document. • If you select 256-bit AES, Adobe Acrobat 9 or later or Adobe Reader 9 or later is required to open the document. 6 Create a recipient list for the encrypted PDF. Always include your own certificate in the recipient list so that you are able to open the document later. • Click Search to locate identities in a directory server or in your list of trusted identities. • Click Browse to locate the file that contains certificates of trusted identities. • To set printing and editing restrictions for the document, select recipients from the list, and then click Permissions. Last updated 10/11/2011