Sharing your pictures is always a risky proposition: Regardless of whether you just email them to a friend or post them on a social network, you never know when someone is going to reuse them, without your permission, in a way that you do not approve of.
Watermarker 1.3 (Mac App Store link) gives you a way to solve this problem by superimposing a mark of your choosing to an existing picture, thus “stamping” with your particular imprint. The app supports three different types of watermarks: text, an image, and strike-through (a set of diagonal lines that cross the image from opposite corners, thus making it unusable in a production scenario).
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