According to the latest blog post and adsense, some publishers are afraid that someone will steal their adsense code and put it on inappropriate sites - which could get the publisher banned from adsense.

In order to prevent this, Google has introduced a new “Allowed sites” feature to the adsense interface where publishers can list the websites they actually are using adsense codes on, so even if your code is on an ‘inappropriate’ site (in which I hope MFA sites are counted) - that’s okay, the publisher won’t get banned or paid for that.
There is, ofcourse a google twist to all this. Free Advertising (on websites that woudl otherwise get publishers banned from adsense):
Sites that aren’t on your list can still display ads using your ad code; however, impressions and clicks for these sites won’t appear in your reports, advertisers won’t be charged, and you won’t receive any earnings from them.
Allowed and Clear - Google Adsense blog
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allow me the sites for adds
can you please give me the steps to add another website It won’t let me add another website in the box a error shows up stating one website per line.