Pixelization

Pixelization (British English, pixelisation) is any technique used in editing images or video, whereby an image is blurred by displaying part or all of it at a markedly lower resolution. It is primarily used for censorship. The effect is a standard graphics filter, available in all but the most basic bitmap graphics editors.

Read more about Pixelization:  Pixelization As Censorship, Pixelization in Media, Alternative Techniques, International Legal Standards