digital watermark
nounUK /ˌdɪdʒ.ɪ.təl ˈwɔː.tə.mɑːk/
US /ˌdɪdʒ.ɪ.t̬əl ˈwɑː.t̬ɚ.mɑːrk/
A hidden mark inside a picture, video, or file that shows who made it.
The photographer added a digital watermark so people would know the photo was hers.
OTHER MEANINGS
2. A visible logo or text placed over an image to stop people from copying it.
The preview picture had a big digital watermark across the middle.
3. A secret code in a file that helps a computer tell where the file came from.
The company used a digital watermark to find out who shared the secret file.
4. A pattern added to audio or video that can be detected later.
The movie studio put a digital watermark in the video to catch illegal copies.