Add password security
You can secure a single PDF file or components of a PDF Portfolio with password-based security through either the Password Security dialog box or a custom security scheme. Note that you are allowed to use only the Password Security dialog to encrypt an entire PDF Portfolio.
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Do one of the following to secure a PDF or PDF Portfolio with password security:
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To encrypt a single PDF, open the PDF and do one of the following;
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Choose Security > Encryption > Interactive Password (both) to open the Password Security dialog box. Or, choose Document Properties/ Preferences shortcut >Document Properties… > Security. Select Password Security from the Security Method drop-down menu. If the PDF file is already secured, click Settings… to open the Password Security dialog box.
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You can also apply an existing security scheme (or create a new one) to the document. See Security Scheme.
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To encrypt a component PDF in a PDF Portfolio, open a PDF Portfolio, double-click on the component file and do one of the following:
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Choose Security > Encryption > Interactive Password to open the Password Security dialog box. Or, choose Document Properties/ Preferences shortcut >Document Properties… > Security. Select Password Security from the Security Method drop-down menu. If the PDF file is already secured, click Settings… to open the Password Security dialog box.
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You can also apply an existing security scheme (or create a new one) to the document. See Security Scheme.
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To encrypt an entire PDF Portfolio, open a PDF Portfolio and do the following:
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Choose File 
> Document Properties…. In the Document Properties dialog box, on the Security tab, Select Password Security from the Security Method drop-down menu. If the PDF file is already secured, click Settings… to open the Password Security dialog box.
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In the Password Security dialog box, do any of the following and then click OK:
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To limit the access to authorized users who have the open password, define the compatibility and the document components to encrypt, select Allow document opening only by password, and then enter a password in the Document Open Password
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To restrict permissions for a file, define the compatibility, select Set a permissions password to restrict editing of security settings and enter a password in the Permissions Password Then you can specify restrictions for printing, changes, copying of text, images, and text access for screen readers.
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In the Password dialog box, retype the same password and then click OK.
