1. A method comprising: obtaining content, wherein the content comprises a steganographic signal hidden therein through subtle changes to data representing the content; accessing a registry including a plurality of steganographic decoding keys to obtain a decoding key associated with the content, wherein at least some of the keys are encrypted; obtaining the decoding key associated with the content or the steganographic signal; decoding the steganographic signal hidden in the content utilizing at least the decoding key associated with the content or the steganographic signal.