| 摘要 |
The present invention provides steganographic embedding techniques. In particular, the present invention provides a stamper (e.g., a rubber stamp) that includes a steganographic signal (e.g., a digital watermark) embedded in a stamping surface pattern thereof. The digital watermark survives in its host pattern when the stamper stamps the host pattern. The digital watermark can be used to authenticate or identify the stamper. The digital watermark can also be used to link to related information.
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