You can use encrypt multiple PDF documents with password or certificate in batch.

  1. Do any of the following to open Batch Encrypt dialog box:

  • Choose Security > Encryption > Batch Encrypt.

  • Choose Start > Recent, and click Protect PDF in Quick Launch.

  1. In the Batch Encrypt dialog box, browse and select the PDF documents or PDF portfolios to protect.

  • Add Files …. Add one or more files to the list (you may use Command button to select multiple files)

  • Add Open Files …. Add one or more currently open files to the list.

  • Delete. Click Delete to remove selected files from the list.

  1. In Security Method drop-down menu, choose Password Security or Certificate Security:

  • Select Password Security to open Password Security dialog box, in which you can protect selected files with password. See Securing PDFs with passwords.

  • Select Certificate Security to open Certificate Security dialog box, in which you can protect selected files with certificate. See Securing PDFs with certificates.

  1. (Optional) Click Settings … to set up a security method. Click Details to view security information of the document.

  2. Click OK to encrypt selected documents in batch.

Note: you are not able to encrypt signed or certified documents. To do so, remove the signature field by choosing Form > Reset Form Fields, or use a predefined Reset Form Fields button.

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