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.
- Compatibility
-
Sets the type of encryption for opening a password-protected document.
The Acrobat 4 (PDF 1.3) option uses a low encryption level
(40‑bit RC4), while the other options use a high encryption level
(128‑bit RC4 or AES).
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 7 (PDF
1.6) option, the document cannot be opened in Acrobat 6.0
or earlier.
- Require A Password To Open The Document
-
Select this option to require users to type the password
you specify to open the document.
- 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.
- Use A Password To Restrict Printing, Editing And Other
Tasks
-
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, Adobe Photoshop, or Adobe
InDesign, the user must enter the Permissions
password, since it is not possible to open the file in a view-only
mode.
- Permissions Password
-
Specify a password that is required to change the permissions
settings. This option is available on 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 Adobe 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.
- Filling In Form Fields And Signing
-
Lets users fill in forms and add digital signatures. This
option doesn’t allow them to add comments or create form fields.
This option is only available for high (128‑bit RC4 or AES) encryption.
- Commenting, Filling In Form Fields, And Signing
-
Lets users add comments and digital signatures, and fill
in forms. This option doesn’t allow users to move page objects or
create form fields.
- Page Layout, Filling in Form Fields, and Signing
-
Lets users insert, rotate, or delete pages and create bookmarks
or thumbnail images, fill out forms, and add digital signatures.
This option doesn’t allow them to create form fields. This option
is only available for low (40‑bit RC4) encryption.
- Any Except Extracting Pages
-
Lets users edit the document, create and fill in form fields,
and add comments and digital signatures.
- Enable Copying Of Text, Images, And Other Content
-
Lets users select and copy the contents of a PDF.
- Enable Copying Of Content And Access For The Visually
Impaired
-
Lets visually impaired users use screen readers to read and
copy the document. This option is only available for low (40‑bit
RC4) encryption.
- Enable Text Access For Screen Reader Devices For The
Visually Impaired
-
Lets visually impaired users read the document with screen
readers, but doesn’t allow users to copy or extract the document’s
contents. This option is available only for high (128-bit RC4 or
AES) encryption.
- Enable Plaintext Metadata
-
Allows users to copy and extract content from the PDF. This
option is only available when Compatibility is set to Acrobat 6
(PDF 1.5) or later. Selecting this option allows storage/search
systems and search engines to access metadata stored in the document.