Is there a standard definition of watermark information?
No, although the debate regarding how universal any digital watermarking system may be is now taking place. Besides the debates within the content business on Digital Television, copy control techniques initiated by legislative pressures such as the Hollings Bill and several other bills introduced in Congress, it is clear the technology of watermarking suffers most from misguided expectations that any one implementation can handle several even conflicting purposes. First, the Secure Digital Music Initiative (SDMI), an ad hoc industry group whose membership included Blue Spike and companies from the consumer electronics and recorded music industries, roughly defined a digital watermarking specification to protect recorded music that is vended via digital music distribution. (Players using the SDMI-specified watermark system had been introduced in 2000.) Still, technically speaking, the specification SDMI defined for digital watermarks only addresses the file header and watermark payload
