Blocked Keywords
Blocked Keywords are Keywords that cannot be purchased. They are blocked from incorporation into a keyword targeting feature, and as such cannot be bid on.
Blocked URLs
Blocked URLs refer to the Destination URLs used by Advertisers. If an Ad uses a Destination URL that has been blocked in the system, that ad will not be shown, and will simply be exempted from further presentation until the destination URL is updated to be a valid, unblocked URL.