According to Crunchgear, Apple has begun building HDCP (High-Bandwidth Digital Content Protection) into their new MacBooks in order to protect iTunes Store purchased media.
Users trying to connect to a TV via HDMI or DVI should be fine, but users with VGA or component/composite ports only may have issues.
To understand more about what exactly HDCP is, please read our glossary entry here: High-Bandwidth Digital Content Protection.
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