Images are steganographically marked with codes that can be used, e.g., by reference to a remote registry, to identify the image proprietors. Some embodiments pre-mark blank emulsion film or paper products with such codes, so that images formed thereon can be traced back to their proprietors. A variety of other embodiments and technologies are also disclosed.

 
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< Digital broadcast receiving apparatus, and a method for receiving digital broadcasts

> Method for verifying the use of public keys generated by an on-board system

> Method which uses a non-volatile memory to store a crypto key and a check word for an encryption device

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