LiveCycle server has encryption service :
http://help.adobe.com/en_US/livecycle/11.0/Services/WS92d06802c76abadb63593c9d12dbeb3ce5c-8000.2.htmlBesides,
standalone Acrobat also has this capability :
http://www.adobe.com/au/products/acrobat/protect-pdf-security-encryption.htmlThanksWasil