With a visible watermark clearly visible copyright tag is attached to the object to be protected, unauthorized use and always leads to a (albeit sometimes marginal) loss of quality. After buying a legitimate media product visible watermarks are usually removed or inserted invisible watermark.
In (invisible) robust watermark rights-related information is “hidden” in the content, ie stored invisibly and inextricably connected with the work. Such information is often used to check for access and use rights and for billing purposes. Occasionally robust watermark include information on the licensee. In the latter case it is called a digital fingerprint that can be used for legal or Network Device Configuration Management purposes.
(Invisibility) fragile watermarks are used to prove the authenticity (integrity and integrity) to detect tampering. Here, it is checked whether a media file has been tampered with. Both come with the robust and invisible watermark in the steganographic algorithms are used.
