This topic does not apply to the DITA Rendition Engine.
The PDF style template has a user password which allows opening of documents, and a master password that is required to change permissions and passwords on published documents that are generated using a PDF style template. The passwords entered in the Security screen are encrypted by the Blowfish encryptions algorithm. In cases where the password or key are compromised, or for some other security reason, the administrator can change the encryption key.
For additional information, see the Change the publish security key topic.