On Tuesday night Apple released an update to QuickTime which fixes a controversial issue affecting the new MacBook, second generation MacBook Air and MacBook Pro notebooks.
The complaint from users of the new notebooks was that standard definition movies purchased from the iTunes store would not playback on an external display due to HDCP restrictions.
Apple writes the following about the update:
This update is recommended for owners of MacBook, MacBook Air, and MacBook Pro with Mini DisplayPort. The update addresses an issue where some standard definition purchases from the iTunes Store do not play on some external displays.
The update means that content purchased from the iTunes store should now playback with no issues.