Strathclyde Forensics are currently evaluating Belkasoft's Photo Manipulation (forgery) Detection software. The results of a test sample are shown in the pictures below (source: Belkasoft)
Digital artifacts are subject to forgery as much as any others. Documents, images, sound recordings, can all be manipulated. Detecting digital forgeries is a sophisticated skill. We have worked on several cases of video and images, where we detected manipulation of some kind.
Forgeries can be also digital and tangible. There are cases of forged CD and DVD disks, credit cards, loyalty cards, and even travel cards like London's Oyster.
Forged DVDs from China or other far Eastern countries, can be excellent. We have acquired DVDs that look better than the original ones.
Forged images like the one on the left, can be used for a variety of reasons, from accusing someone, to make claims on land and property.
All digital files, media or documents however have hidden information inside them, what we call "metadata". This metadata is often the source of information that will identify a forged item and its source.