Adobe 22002484 User Guide - Page 221

USING ACROBAT 9 STANDARD 216 Security Securing documents with passwords Add password security You can limit access to a PDF by setting passwords and by restricting certain features, such as printing and editing. Passwords cannot be added to a document if it is already signed or certified. Two types of passwords are available: Document open password With a document open password (also known as a user password), users must type in the password you specify to open the PDF. Permissions password When you set only a permissions password (also known as a master password), recipients don't need a password to open the document. However, they must type the permissions password to set or change the restricted features. 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. All Adobe products enforce the restrictions set by the permissions password. However, if third-party products do not support or respect these settings, document recipients are able to bypass some or all of the restrictions you set. Important: If you forget a password, there's no way to recover it from the PDF. Consider keeping a backup copy of the PDF that isn't password-protected. 1 Do one of the following: • In a single PDF or component PDF in a PDF Portfolio, open the PDF and choose Advanced > Security > Encrypt With Password. (You can also choose File > Properties and select the Security tab.) • In a PDF Portfolio, open the PDF Portfolio and choose File > Modify PDF Portfolio > Secure Portfolio. In the Security Method menu, select Password Security. Note: If these options are unavailable, it's either because the document or PDF Portfolio already includes security settings, or the PDF was created in LiveCycle Designer ES. 2 If you receive a prompt, click Yes to change the security. 3 Select a compatibility level. This option sets the encryption level and key size. Encryption algorithm and key size are version specific. Ensure that your encryption level is equal to or lower than the recipients' version of Acrobat or Reader. 4 Select the document components to encrypt. To allow the document contents to be searched, leave the metadata unencrypted. To create security envelopes, use Encrypt Only File Attachments. 5 Select the type of password to add, and then type the password in the corresponding field. If you are setting a permissions password, determine the level of access. 6 To allow recipients to copy PDF content to another document, select Enable Copying Of Text, Images, And Other Content. 7 Click OK. At the prompt to confirm each password, retype the appropriate password in the box and click OK. Last updated 9/30/2011