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Adobe ACROBAT X STANDARD Manual

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USING ACROBAT X STANDARD
Security
Last updated 10/11/2011
Security options
You can set the following options when you create a PDF or when you apply password protection to a PDF. Options
vary depending on the Compatibility setting. Security options are not available for PDF/X standards or presets. The
names of the settings may vary in different applications.
Compatibility Sets the type of encryption for opening a password-protected document. If you choose Acrobat 3.0 And
Later (PDF 1.3) option, a low-encryption-level security (40-bit RC4) is used. If you choose Acrobat 5.0 And Later (PDF
1.4) or Acrobat 6.0 And Later (PDF 1.5), a high encryption level (128-bit RC4) is used. Choosing Acrobat 7.0 And Later
(PDF 1.6) encrypts the document using the AES encryption algorithm with a 128-bit key size. Acrobat X And Later
(PDF 1.7) encrypts the document using 256-bit AES.
Note: Select Acrobat X And Later to apply 256-bit AES encryption to Acrobat 8 and 9 documents.
Be aware that anyone using an earlier version of Acrobat cannot open a PDF document with a higher compatibility
setting. For example, if you select the Acrobat
X and later option, the document cannot be opened in Acrobat 7 or
earlier.
Encrypt All Document Contents (Acrobat) Select this option to encrypt the document and the document metadata. If
this option is selected, search engines cannot access the document metadata.
Encrypt All Document Contents Except Metadata (Acrobat) Select this option to encrypt the contents of a document
but still allow search engines access to the document metadata.
Encrypt Only File Attachments (Acrobat) Select this option to require a password for opening file attachments.
However, users can open the document without a password.
Require A Password To Open The Document Select this option to require users to type the password you specify to
open the document. This option is unavailable if Encrypt Only File Attachments is selected.
Document Open Password Specify the password that users must type to open the PDF file.
Note: If you forget a password, there is no way to recover it from the document. It’s a good idea to store passwords in a
separate secure location in case you forget them.
Restrict Editing And Printing Of The Document Restricts access to the PDF file’s security settings. If the file is opened
in Adobe Acrobat, the user can view the file but must enter the specified Permissions password in order to change the
file’s Security and Permissions settings. If the file is opened in Illustrator, Photoshop, or InDesign, the user must enter
the Permissions password, since it is not possible to open the file in a view-only mode.
Change Permissions Password Specify a password that is required to change the permissions settings. This option is
available only if the previous option is selected.
Printing Allowed Specifies the level of printing that users are allowed for the PDF document.
• None Prevents users from printing the document.
• Low Resolution (150 dpi) Lets users print at no higher than 150-dpi resolution. Printing may be slower because
each page is printed as a bitmap image. This option is available only if the Compatibility option is set to Acrobat
5 (PDF
1.4) or later.
• High Resolution Lets users print at any resolution, directing high-quality vector output to PostScript and other
printers that support advanced high-quality printing features.
Changes Allowed Defines which editing actions are allowed in the PDF document.
• None Prevents users from making any changes to the document that are listed in the Changes Allowed menu, such
as filling in form fields and adding comments.
• Inserting, Deleting, And Rotating Pages Lets users insert, delete, and rotate pages, and create bookmarks and
thumbnails. This option is only available for high (128-bit RC4 or AES) encryption.
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