Adobe 62000112DM User Guide - Page 253

ADOBE ACROBAT 3D VERSION 8 246 User Guide Share your certificate Your digital ID includes a certificate that others require to validate your signature and encrypt documents for you. 1 Choose Advanced > Security Settings. 2 Select Digital IDs on the left. 3 Select the ID you want to share, and click Export . 4 Follow the on-screen instructions to email the certificate or save it to a file. If you use a third-party security method, you usually don't need to share your certificate with others. See also "Sharing certificates with others" on page 258 Add a document password One way to restrict access to a PDF is to add a Document Open password. Important: There is no way to open the PDF if you forget the password. 1 Click Secure on the Tasks toolbar, and choose Password Encrypt. 2 Select Require A Password To Open The Document, and type a case-sensitive password in the text box. If the PDF already has security applied, you may need to supply the Permissions password that lets you change security settings. See also "Set passwords for PDFs" on page 264 Prevent changes to a PDF Add security restrictions to help prevent others from changing your PDF. 1 Click Secure on the Tasks toolbar, and choose Password Encryption. 2 Select Restrict Editing And Printing Of The Document, and type a Permissions password. 3 Choose an option from the Changes Allowed menu. For information on using other security methods to restrict access, see Help. See also "Set passwords for PDFs" on page 264 Create secure attachments You can add security to both PDF and non-PDF documents by embedding them in an encrypted envelope, called a security envelope, that you can send as an email attachment. 1 Click Secure on the Tasks toolbar, and choose Create Security Envelope. 2 Click Add File To Send, and select the desired documents. 3 Click Next, and follow the on-screen instructions to create the security envelope.