Xobjects - Adobe 12001196 - Acrobat - Mac Manual

Section 8 External Content Access
8.2.3.3 Up to 9.2-8.1.7
These product versions displayed the dialog below rather than the YMB.
9.2-8.1.7 and earlier: Manage Trust for Multimedia Content dialog

8.3 XObjects

Changes across releases: XObject (external stream) access
Version
pre 9.2 External streams can be managed through preferences in the user interface.
8.1.7 & 9.2 External streams can be blocked by enabling enhanced security.
The application can inform you when a PDF file tries to access external content identified as a stream
object by flags which are defined in the PDF Reference. For example, an URL might point to an image
external to the document. Only PDF developers create PDF files with streams, so you may not need to
enable access to external content. This feature interacts with enhanced security as shown below:
XObjects and enhanced security
XObject
setting Enhanced Security
Never On
Never Off
Always On (w/ privileged location set)
Always Off
To configure external content access:
Page 82
Change
No XObject access; proxy displays, if any.
No XObject access; proxy displays, if any.
XObject displays.
No XObject access; proxy displays, if any.
Application Security Guide
Behavior
Section 8 External Content Access