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For a full list of articles about security, see Overview of security in Acrobat and PDF content.

Acrobat and Reader warn you any time you try to open a URL (website) or a file attachment that uses a disallowed file type. URLs and disallowed file types are potentially dangerous because they can transfer or run programs, macros, or viruses that can damage your computer. Examples of disallowed file types include .exe and .zip files.

Documents can be secured in several ways. To view the security settings of a document, choose File > Properties in Acrobat or Reader. From the Document Properties dialog box, click the Security tab. If you have trouble opening a PDF, or you’re restricted from using certain features, contact the author of the PDF.

Password protected

A password-protected PDF either requires a password to open or a password to change or remove restricted operations. If a document has restricted features, tools and options related to those features are dimmed.

Certified

Certifying a document assures recipients that the document is authentic. Certifying signatures also include information to allow or disallow particular actions, such as filling forms and modifying the document. When you submit a certified form, you are assured that it is going back to the valid author. A document with a valid certificate displays a Blue Ribbon icon . A PDF Portfolio with a valid certificate displays a Signature Badge.

Signature Badge
A <span class="uicontrol">PDF Portfolio</span> with a certifying signature

Adobe LiveCycleRights Management ES configured

Adobe LiveCycleRights Management ES (ALCRMS) lets you manage accounts and configure security policies for your organization. ALCRMS lets you apply a policy to documents without the need for digital signatures and certificates.

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