Quality is subjective. Quality can be objectified by the industry standards process represented by such consumer items as compact disc ("CD") and digital versatile disc ("DVD"). What is lacking is a means for not only associating the creation of valued intangible assets and extensions of recognition but establishing responsibility for copies that may be digitized or pass through a digital domain. Digital watermarking exists at a convergence point between piracy and privacy. Watermarks serve as a receipt for information commerce. There is not likely to be a single digital watermark encoding scheme that best handles the trade-offs between security, robustness, and quality but several architectures to handle various concerns. The most commercially useful watermarking schemes are key-based, combining cryptographic features with models of perception. Most importantly, in audio watermarking there currently exists mature technologies which have been proven to be statistically inaudible.