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A digital watermark system embeds auxiliary signals in multimedia types, including audio, still and moving images, and physical objects. These auxiliary signals, referred to as digital watermarks, include multiple components that can perform differing functions and that are embedded with different l

A digital watermark system embeds auxiliary signals in multimedia types, including audio, still and moving images, and physical objects. These auxiliary signals, referred to as digital watermarks, include multiple components that can perform differing functions and that are embedded with different levels of redundancy, potentially within different transform domains of the host signal.

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I claim: 1. A watermark embedded in an electronic or physical media, the watermark carrying a machine readable variable message that is embedded in the media by modifying an electronic media signal to hide the machine readable variable message in the electronic media signal before storing the modif

I claim: 1. A watermark embedded in an electronic or physical media, the watermark carrying a machine readable variable message that is embedded in the media by modifying an electronic media signal to hide the machine readable variable message in the electronic media signal before storing the modified electronic media signal on the media, the watermark comprising two or more components, at least one of the components being encoded more redundantly than another component. 2. The watermark of claim 1 wherein the components are sets of binary numbers in a multibit watermark message, the message being error correction coded such that at least one set of binary numbers is encoded more redundantly than another set. 3. The watermark of claim 1 wherein the components include components in different transform domains. 4. The watermark of claim 3 wherein one of the transform domains is a spatial domain and another is a spatial frequency domain. 5. The watermark of claim 1 wherein one of the components carries a message, and another component acts as orientation signal used to identify a location of the watermark in the media. 6. The watermark of claim 1 wherein one of the components cames a message payload and is used in locating the watermark in the media. 7. The watermark of claim 1 wherein at least one of the components is more redundant in a spatial domain than another component. 8. The watermark of claim 1 wherein at least one of the components is more redundant in a spatial frequency domain than another component. 9. A watermark embedded in an electronic or physical media, the watermark carrying a machine readable variable message that is embedded in the media by modifying an electronic media signal to hide the machine readable variable message in the electronic media signal before storing the modified electronic media signal on the media, the watermark comprising two or more signal components, the signal components being encoded such that each component has a different signal strength. 10. The watermark of claim 9 wherein a gain is applied to each component such that the components have different signal strength. 11. The watermark of claim 9 wherein at least one of the components is encoded more redundantly such that it has greater signal strength than another component. 12. The watermark of claim 9 including at least first and second components, each carrying messages, and the first component carries a shorter message and has a stronger signal strength than the second component. 13. The watermark of claim 12 wherein the first and second components are multibit messages, and one multibit message is encoded more redundantly than the other. 14. The watermark of claim 12 wherein the first and second components are defined in the same transform domain. 15. The watermark of claim 12 wherein the first and second components are defined in different transform domains. 16. A method for embedding a digital watermark in an electronic or physical media, the digital watermark carrying a machine readable variable message that is embedded in the media by modifying an electronic media signal to hide the machine readable variable message in the electronic media signal before storing the modified electronic media signal on the media, the method comprising: providing two or more components of the digital watermark; and encoding the two or more components into the media, at least one of the components being encoded more redundantly than another component. 17. The method of claim 16 wherein the components are sets of binary numbers in a multibit watermark message, the message being error correction coded such that at least one set of binary numbers is encoded more redundantly than another set. 18. The method of claim 16 wherein the components include components in different transform domains. 19. The method of claim 18 wherein one of the transform domains is a spatial domain and another is a spatial frequency domain. 20. The method of claim 16 wherein one of the components carries a message, and another component acts as a registration signal used to identify a location of the watermark in the media. 21. The method of claim 16 wherein one of the components carries a message payload and is used in locating the watermark in the media. 22. The method of claim 16 wherein at least one of the components is more redundant in a spatial domain than another component. 23. The method of claim 16 wherein at least one of the components is more redundant in a spatial frequency domain than another component. 24. A method of watermark embedding in an electronic or physical media, the watermark carrying a machine readable variable message that is embedded in the media by modifying an electronic media signal to hide the machine readable variable message in the electronic media signal before storing the modified electronic media signal on the media, the method comprising: providing two or more signal components of the watermark; and encoding the signal components into the media such that each component has a different signal strength. 25. The method of claim 24 wherein a gain is applied to each component such that the components have different signal strength. 26. The method of claim 24 wherein at least one of the components is encoded more redundantly such that it has greater signal strength than another component. 27. The method of claim 24 including at least first and second components, each carrying messages, and the first component carries a shorter message and has a stronger signal strength than the second component. 28. The method of claim 27 wherein the first and second components are multibit messages, and one multibit message is encoded more redundantly than the other. 29. The method of claim 27 wherein the first and second components are defined in the same transform domain. 30. The method of claim 27 wherein the first and second components are defined in different transform domains. 31. A method for embedding a dinital watermark in an electronic or physical media, the digital watermark carrying machine readable data that is embedded in the media by modifying an electronic media content signal to hide the machine readable datas in the electronic media content signal, and then storing the modified electronic media content signal on the media, the method comprising: modifying a version of the electronic media content signal to steganographically encode first machine readable data therein; and modifying a version of the electronic media content signal to steganographically encode second machine readable data therein, said second machine readable data being different than the first machine readable data; wherein the modified electronic media content signal stored on the media conveys both the first and second machine readable data. 32. The method of claim 31 wherein the encoded first machine readable data has a spectral composition different than a spectral composition of the encoded second machine readable data. 33. The method of claim 31 wherein the first machine readable data is encoded with a first strength, and the second machine readable data is encoded with a second strength less than the first. 34. The method of claim 31 wherein the first machine readable data is redundantly encoded more times in the electronic media content signal than the second machine readable data. 35. The method of claim 31 wherein the information content of the second machine readable data is greater than the information content of the first machine readable data. 36. The method of claim 31 that includes: transforming the electronic media content signal from an original domain into a different domain; encoding one of said first or second machine readable data while the electronic media content signal is represented in said different domain; and transforming the electronic media content signal from said different domain back to the original domain. 37. The method of claim 31 that includes steganographically encoding the electronic media content signal with the second machine readable data, and thereafter steganographically encoding the thus-encoded electronic media content signal with the first machine readable data. 38. The method of claim 31 wherein the steganographic encoding of the electronic media content signal with the first machine readable data includes processing in accordance with first noise-like data, and the steganographic encoding of the electronic media content signal with the second machine readable data does not include processing in accordance with said first noise data. 39. The method of claim 31 wherein one of said first or second machine readable data indicates that the electronic media content signal is copyrighted. 40. The method of claim 31 wherein one of said first or second machine readable data serves as subliminal registration data. 41. The method of claim 31 wherein encoding of at least one of said first and second machine readable data is perceptually adapted in accordance with an attribute of the electronic media content signal, to enhance hiding. 42. The method of claim 31 wherein the electronic media content signal represents audio. 43. The method of claim 31 wherein the electronic media content signal represents video. 44. The method of claim 31 wherein the electronic media content signal represents a still image. 45. The method of claim 44 that includes printing a physical media substrate in accordance with said still image electronic media content signal. 46. The method of claim 31 that additionally includes steganographically encoding with third machine readable data different than both the first and second machine readable data. 47. The method of claim 31 wherein the first machine readable data is encoded using a first steganographic encoding algorithm, and the second machine readable data is encoded using a second steganographic encoding algorithm different than the first. 48. A computer readable medium having stored thereon instructions causing a computer to perform the method of claim 31.