Fogging (censorship) - Definition from the Hotspot Shield Encyclopedia
When concerned with Censorship, fogging is a type of censorship of visual media like photographs and videos. The process will involve marking a part of the image or video blurred so the certain feature cannot be identified. This form of censorship is primarily used to protect peoples privacy and to hid their faces, but is also used to hide sexual acts or exposed genitals.
Applications like Google Street View will use fogging to protect peoples privacy on photos of public streets and areas around the world. Fogging may also be used in criminal cases or news stories if a person does not want to be publically identified, or if a persons identity must be kept secret for their own safety (witnesses etc in criminal cases).