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In this scenario, digital watermarking may be useful to set up controlled audio distribution and to provide efficient means for copyright protection, usually in collaboration with international registration bodies.There are a number of possible applications for digital watermarking technologies and this number is increasing rapidly.The hiding process has to be such that the modifications of the media are imperceptible.
The picture on the left shows a printing machine from Intercard for various types of plastic cards (Courtesy of Intercard, Switzerland).
Another application is the authentication of image content.
Digital Watermarking describes methods and technologies that hide information, for example a number or text, in digital media, such as images, video or audio.
The embedding takes place by manipulating the content of the digital data, which means the information is not embedded in the frame around the data.
Such applications are especially of interest for official documents, such as contracts.
For example, the digital watermark can be used to embed the name of the lawyer or other key monetary amounts.In some cases, the watermark may need to be fragile."Fragile" means that the watermark should not resist tampering, or would resist only up to a certain, predetermined extent.But it would also be hidden as an invisible watermark in the passport photo.If anyone tries to tamper with the passport by replacing the photo, it would be possible to detect the change by scanning the passport and verifying the name hidden in the photo.Image (a) shows an original photo of a car that has been protected with a watermarking technology.In photo (b), the same picture is shown, but with a small modification: the numbers on the license plate have been changed.For example, in the field of data security, watermarks may be used for certification, authentication, and conditional access.Certification is an important issue for official documents, such as identity cards or passports.On the left is an example of a protected identity card.The identity number "123456789" is written in clear text on the card and hidden as a digital watermark in the identity photo.