Google says this about the new feature:
Quote:
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We've added the Allowed Sites feature because we've learned that some AdSense publishers are concerned about potentially malicious behavior from others on the web, such as stealing their ad code and placing it on an inappropriate site. By offering this feature, we allow AdSense publishers more control over which sites or URLs can have their AdSense code.
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This link is to some official Google comments from Google about his feature
Inside AdSense: Allowed and clear