Invisible watermark app, is a unique and no network needed app. That can easily add some text like your signature on pictures. Other guys who will see your picture will never know there has invisible watermark on it.
So what we can do:
1. Add customize text watermark;
2. Share the generate pictures to network;
3. Load previous or third part invisible watermark pictures, and check its original author.
Note: its better to use white background pictures to add watermark.