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Introducing Adobe Reader Protected Mode

...Scheduled for inclusion in the next major version release of Adobe Reader, Protected Mode is a sandboxing technology based on Microsoft’s Practical Windows Sandboxing technique. It is similar to the Google Chrome sandbox and Microsoft Office 2010 Protected Viewing Mode...

With Adobe Reader Protected Mode enabled (it will be by default), all operations required by Adobe Reader to display the PDF file to the user are run in a very restricted manner inside a confined environment, the “sandbox.” Should Adobe Reader need to perform an action that is not permitted in the sandboxed environment, such as writing to the user’s temporary folder or launching an attachment inside a PDF file using an external application (e.g. Microsoft Word), those requests are funneled through a “broker process,” which has a strict set of policies for what is allowed and disallowed to prevent access to dangerous functionality.