An article including: an optical storage medium; and a machine readable mark on at least one side of the optical storage medium, wherein the machine readable mark is adapted to permit activation of a metered account. In embodiments the article can include a detachable member attached to the storage medium, where the detachable member bears a machine readable mark on at least one side and the detachable member can be detached from the optical storage medium after activation of the metered account. The invention also includes printing methods for making the article.

 
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< Changeable machine readable assaying indicia

> Apparatus and method for detecting and correcting a corrupted broadcast time code

> Audio component front face

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