The Help tệp tin for Acrobat XI will show you the way.
Some of the discussions present:
Remove encryption settings
1 Do one of the following:
• For a single PDF or a component PDF in a PDF Portfolio, open the PDF.
• For a PDF Portfolio, open the PDF Portfolio and choose View > Portfolio > Cover Sheet.
2 Select Tools > Protection > Encrypt > Remove. If you don’t see the Protection panel, see the instructions for adding panels at “Task panes” on page 9.
3 If prompted, type the permissions password. If you don’t know the permissions password, tương tác the author of the PDF.
Delete your digital ID
When you delete a digital ID in Acrobat, you delete the actual PKCS #12 tệp tin that contains both the private key and the certificate. Before you delete your digital ID, ensure that it isn’t in use by other programs or required by any documents for decrypting.
Note: You can delete only self-signed digital IDs that you created in Acrobat. A digital ID obtained from another provider cannot be deleted.
1 Do one of the following: • In Acrobat, choose Tools > Protection > More Protection > Security Settings. • In Reader, choose Edit > Protection > Security Settings.
Note: If you don’t see the Protection panel, see the instructions for adding panels at “Task panes” on page 9.
2 Select Digital IDs on the left, and then select the digital ID to tướng remove.
3 Click Remove ID, and then click OK.
Delete a certificate from trusted identities
1 Do one of the following: • In Acrobat, choose Tools > Sign và Certify > More Sign và Certify > Manage Trusted Identities. • In Reader, choose Edit > Protection > Manage Trusted Identities.
Note: If you don’t see the Sign và Certify or Protection panel, see the instructions for adding panels at “Task panes” on page 9.
2 Choose Certificates from the Display thực đơn.
3 Select the certificate, and click Delete.
Be well...