have you ever heard about digital watermarking? well, according to Webodia,
"digital watermark (also referred to as simply watermarking) is a pattern of bits inserted into a digital image, audio or video file that identifies the file's copyright information (authors, rights, etc). The purpose of digital watermarks is to provide copyright protection for intellectual property that's in digital format."
example of watermarking:
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| mine :) |
you can watermark your photos online here.
p/s: happy watermarking! :D
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