Watermarking refers to the type of technology used to embed information, including content usage rules, securely into a video or audio signal. Watermarks are designed to be imperceptible by the audience, and they travel with the content even over analog interfaces. Watermarks are directly embedded into the actual content itself and therefore are difficult to remove. Furthermore, watermarks survive and “travel with” content as it is converted from digital to analog form or is re-digitized from analog back into digital. While watermark technology permits content protection rules to “stay with” content, watermarks do not, in and of themselves, protect the content. Watermarking is simply a technology for signaling information and usage rights to devices that may receive the content.