how to password protect a pdf

how to password protect a pdf
Password security basics
how to password protect a pdf
You can limit access to a PDF by setting passwords and by restricting certain features, such as printing and editing. However, you cannot prevent saving copies of a PDF. The copies have the same restrictions as the original PDF. Two types of passwords are available:
how to password protect a pdf
Document open password A Document Open password (also known as a user password) requires a user to type a password to open the PDF.
how to password protect a pdf
Permissions password A permissions password (also known as a master password) requires a password to change permission settings. Using a permissions password, you can restrict printing, editing, and copying content in the PDF. Recipients don’t need a password to open the document in Reader or Acrobat. They do need a password to change the restrictions you've set.
how to password protect a pdf
If the PDF is secured with both types of passwords, it can be opened with either password. However, only the permissions password allows the user to change the restricted features. Because of the added security, setting both types of passwords is often beneficial.

how to password protect a pdf
Note: You cannot add passwords to a signed or certified document. 
how to password protect a pdf
Add a password to a PDF
how to password protect a pdf
1. Open the PDF and choose Tools > Protect > Encrypt > Encrypt with Password.
how to password protect a pdf
2. If you receive a prompt, click Yes to change the security.
how to password protect a pdf
3. Select Require A Password To Open The Document, then type the password in the corresponding field. For each keystroke, the password strength meter evaluates your password and indicates the password strength.

how to password protect a pdf
Password Security - Settings let you set a password to open a PDF
how to password protect a pdf
4. Select an Acrobat version from the Compatibility drop-down menu. Choose a version equal to or lower than the recipients’ version of Acrobat or Reader.
how to password protect a pdf
Options control compatibility with previous versions and type of encryption
how to password protect a pdf
The Compatibility option you choose determines the type of encryption used. It is important to choose a version compatible with the recipient's version of Acrobat or Reader. For example, Acrobat 7 cannot open a PDF encrypted for Acrobat X and later.
how to password protect a pdf

  • Acrobat 6.0 And Later (PDF 1.5) encrypts the document using 128-bit RC4.
  • 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. To apply 256-bit AES encryption to documents created in Acrobat 8 and 9, select Acrobat X And Later.
5. Select an encryption option:
how to password protect a pdf
Encrypt All Document Contents Encrypts the document and the document metadata. If this option is selected, search engines cannot access the document metadata.
how to password protect a pdf
Encrypt All Document Contents Except Metadata Encrypts the contents of a document but still allows search engines access to the document metadata.

how to password protect a pdf
Note: The iFilter and the Find or Advance Search commands of Acrobat do not look into the PDF’s metadata even when you select the Encrypt All Document Contents Except Metadata option. You can use a search tool that takes advantage of XMP metadata.
how to password protect a pdf
6. Click OK. At the prompt to confirm the password, retype the appropriate password in the box and click OK.
how to password protect a pdf
Restrict editing of a PDF
how to password protect a pdf
You can prevent users from changing PDFs. The Restrict Editing option prohibits users from editing text, moving objects, or adding form fields. Users can still fill in form fields, sign, or add comments.

how to password protect a pdf
1. Open the PDF and choose Tools > Protect > Restrict Editing.
how to password protect a pdf
2. If you receive a prompt, click Yes to change the security.
how to password protect a pdf
3. Type the password in the corresponding field. For each keystroke, the password strength meter evaluates your password and indicates the password strength.

how to password protect a pdf
Permissions password restricts editing
how to password protect a pdf
4. Click OK, and then save the PDF to apply the restrictions.
how to password protect a pdf
Restrict printing, editing, and copying
how to password protect a pdf
You can prevent users from printing, editing, or copying content in a PDF. You can set the restrictions you want to apply to the PDF. Users cannot change these restrictions unless you give them password.
how to password protect a pdf
Illustrator, Photoshop, or InDesign do not have view‑only modes. To open a restricted PDF in these applications, the user must enter the permissions password.

how to password protect a pdf
Note: If you forget a password, you cannot recover it from the PDF. Consider keeping a backup copy of the PDF that isn’t password-protected.
how to password protect a pdf
1. Open the PDF and choose Tools > Protect > Encrypt > Encrypt with Password.
how to password protect a pdf
2. If you receive a prompt, click Yes to change the security.
how to password protect a pdf
3. Select Restrict Editing And Printing Of The Document.
All Adobe products enforce the restrictions set by the permissions password. However, if third-party products do not support these settings, document recipients are able to bypass some or all of the restrictions you set.
how to password protect a pdf
4. Type the password in the corresponding field. For each keystroke, the password strength meter evaluates your password and indicates the password strength.

how to password protect a pdf
Password Security - Settings let you restrict printing, editing, and copying
how to password protect a pdf
5. Select what the user can print from the Printing Allowed menu:
how to password protect a pdf
None Prevents users from printing the document.
how to password protect a pdf
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.
how to password protect a pdf

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.
how to password protect a pdf
6. Select what the user can change from the Changes Allowed menu:
how to password protect a pdf
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.
how to password protect a pdf
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.
how to password protect a pdf
Filling In Form Fields And Signing Existing Signature Fields 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.
how to password protect a pdf
Commenting, Filling In Form Fields, And Signing Existing Signature Fields 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.
how to password protect a pdf
Any Except Extracting Pages Lets users edit the document, create and fill in form fields, and add comments and digital signatures.

how to password protect a pdf
7. Choose any of the following options:
how to password protect a pdf
Enable Copying Of Text, Images, And Other Content Lets users select and copy the contents of a PDF.
how to password protect a pdf
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.

how to password protect a pdf
8. Select an Acrobat version from the Compatibility menu. Choose a version equal to or lower than the recipients’ version of Acrobat or Reader. The Compatibility option you choose determines the type of encryption used. It is important to choose a version compatible with the recipient's version of Acrobat or Reader. For example, Acrobat 7 cannot open a PDF encrypted for Acrobat X and later.
how to password protect a pdf
how to password protect a pdf
  • Acrobat 6.0 And Later (PDF 1.5) encrypts the document using 128-bit RC4.
  • 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. To apply 256-bit AES encryption to documents created in Acrobat 8 and 9, select Acrobat X And Later.
9. Select what you want to encrypt:
how to password protect a pdf
Encrypt All Document Contents Encrypts the document and the document metadata. If this option is selected, search engines cannot access the document metadata.
how to password protect a pdf
Encrypt All Document Contents Except Metadata Encrypts the contents of a document but still allows search engines access to the document metadata.
how to password protect a pdf
Note: The iFilter and the Find or Advance Search commands of Acrobat do not look into the PDF’s metadata even when you select the Encrypt All Document Contents Except Metadata option. You can use a search tool that takes advantage of XMP metadata.
how to password protect a pdf
how to password protect a pdf
Encrypt Only File Attachments Requires a password to open file attachments. Users can open the document without a password. Use this option to create security envelopes.
how to password protect a pdf
10. Click OK. At the prompt to confirm the password, retype the appropriate password in the box and click OK.
how to password protect a pdf
Remove password security
how to password protect a pdf
You can remove security from an open PDF if you have the permissions to do so. If the PDF is secured with a server-based security policy, only the policy author or a server administrator can change it.
how to password protect a pdf
1. Open the PDF, then select Tools > Protect > Encrypt > Remove Security.
how to password protect a pdf
2. Your options vary depending on the type of password security attached to the document:
  • If the document had only a Document Open password, click OK to remove it from the document.
  • If the document had a permissions password, type it in the Enter Password box, and then click OK. Click OK again to confirm the action.
how to password protect a pdf

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