2013

332
www.xara.com
compromise. As a result, file open passwords should only be used as a means of
security to prevent inexperienced users from accessing sensitive documents.
Document Encryption and Permissions Password
To encrypt a PDF document, select an encryption method and specify and confirm a
password. This password will be required when a user attempts to make changes to
the document, including modifying security and permissions settings. The encryption
password is often referred to as the owner or master password and it may also be
used to open the PDF document.
Additional document permissions settings (outlined in the section below) may be
applied to determine the degree to which a user can interact with the encrypted
document.
Four encryption methods are available:
•
NONE: This setting will not apply any document encryption. This is the default
encryption option for the document.
•
40-BIT RC4: This setting will apply a 40-bit encryption algorithm to the document.
•
128-BIT RC4: This setting will apply a 128-bit encryption algorithm to the
document.
•
128-BIT AES: This setting will apply the 128-bit AES encryption algorithm to the
document. If the PDF document contains confidential or highly sensitive material
this method of encryption is considered to be the most effective means of
securing the contents. Note: PDF 1.6 is required to support this encryption
method.
Document Permissions Settings
The document permissions settings section allows you to specify actions that can be
undertaken on an encrypted PDF document when it is rendered or processed by
another application.
Within the
DOCUMENT PERMISSIONS SUMMARY section, check any of the following
settings to allow a user to perform the following tasks:
Printing: Selecting this option allows a user to print the PDF document. By default this
option is selected.
Extraction for accessibility: Selecting this option allows content to be extracted by
applications that assist users with impairments. By default this option is selected.
Commenting: Checking this option allows users to add comments and annotations to
the PDF document. By default this option is selected.
Modification: Enabling this option allows users to change the contents of the PDF
document. By default this option is selected.