Aoao Photo Watermark

$39.90 $29.90

What is image watermark

Batch watermark software

Create a watermark to your photo

Protect photos copyright

Put text on picture

Select watermark software

How to watermark

Check latest version

Support formats

Watermarked image

What is watermark

Overview

Getting Started

Details of Aoao Photo Watermark

Key Feature

How to Use Aoao Watermark

Watermark Glossary

Sample

Screenshot

Video Watermark Pro

Video to Picture Converter

Video to GIF Converter

SWF to GIF Converter

Add text to a picture

Create watermark

Image watermark

Photo frame

Watermark images

Watermark photos

Add copyright to photo

Add watermark to picture

How to copyright photos

What is Original Image

What is original image brfore watermarking?

Consider the following scenario: Alice, the copyright holder, inserts her own photo watermark into some object, locks the original away and keeps selling the marked image. Bob can now try to insert his own image watermark into the already marked object. In case of a dispute, both Alice and Bob are able to prove the presence of watermark and claim ownership of the document. How can this situation be resolved?

The "traditional" answer is: look at the objects, Alice and Bob claim to be the original. Alice's original should not contain a photo watermark, whereas Bob's "original" must contain Alice's watermark (if we assume that Bob cannot remove marks). This situation would indicate that Bob inserted his watermark software after Alice and so one may conclude that Alice is the rightful owner.

Unfortunately, sometimes the situation is not that simple. It has been shown that, in particular class of watermarking schemes, Bob can insert his digital watermark in a way that it also seems to be present in the copy Alice locked away (although he has no access to it). So Alice's original contains Bob's mark and Bob's "original" contains Alice's mark. This type of attack is called "inversion attack" or more "dead lock attack". There is no way to resolve copyright ownership in this case. This result indicates that watermarking images "alone", that is without a carefully designed protocol around it, will not suffice to resolve the copyright situation.

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