what is a watermark? describe digital watermarking.
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A digital watermark is a kind of marker covertly embedded in a noise-tolerant signal such as audio, video or image data. It is typically used to identify ownership of the copyright of such signal. ... It is prominently used for tracing copyright infringements and for banknote authentication.
Explanation:
a symbol or design in some types of paper, which can be seen when the paper is held against the light
जलांक (कुछ प्रकार के काग़ज़ों में अंकित चिह्न या डिज़ाइन जो काग़ज़ को रोशनी के सामने लाने पर दीखने लगता है) जलचिह्न, वॉटरमार्क
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