In more detail
A semi-transparent watermark across the centre is harder to crop out than one in a corner, but it also detracts from the picture. It deters casual copying; it cannot prevent determined removal.
A watermark is text or a logo laid over an image or document to show ownership or discourage reuse.
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A semi-transparent watermark across the centre is harder to crop out than one in a corner, but it also detracts from the picture. It deters casual copying; it cannot prevent determined removal.