The Security Settings section enables you to protect the output PDF file with a password so that you can limit viewing, editing, printing, and other options to users. The Security Settings tab is only enabled when the Security Parameters checkbox near the top of this tab is selected.
Note: We recommend the highest level where possible.
According to Adobe documents, all Adobe products enforce the restrictions set by the Owner or permissions password. However, if third-party products do not support or respect these settings, document recipients are able to bypass some or all of the restrictions you set.
Important: If you forget a password, there is no way to recover it from the PDF. Consider keeping a backup copy of the PDF that is not password-protected. Currently the security method uses a low level 40-bit RC4 type of encryption which is known to be vulnerable to attacks, with evidence of third-party bypass tools being available. If possible use AES v3 256-bit encryption.
Visual Technology Services is not liable for any loss of data or damages arising from any bypasses of PDF security.
The passwords used in the top fields for Owner and User are exposed if the Settings are Exported, as they are saved in clear text in XML tags. The default (hidden) value can be revealed using this technique, if you have created a secure document with default settings and wish to edit it further in Acrobat.
PDF3D allows user-written custom javascript can be attached to 3D views, please see 'How to Adjust Advanced Parameters' for further information. JavaScript is only enabled when this checkbox is selected. If this checkbox is not ticket, JavaScript is not added to the resultant 3D PDF.