Metadata is textual information embedded in an image file. Not all image file formats are capable of holding metadata, but JPEG, TIFF, PSD and most digital camera RAW formats support it.

Metadata text is only viewable in programs that are capable of displaying it. Photoshop and most advanced image editing and management tools have the capability.

There are two common formats for metadata, EXIF and IPTC. EXIF is most widely used for recording information at the time of exposure. IPTC information is added later.

IPTC information is the standard location for the copyright statement, along with contact details and other information relevant to the image. Neglecting to embed a copyright statement in a file can lead to it becoming untraceable and an 'orphan work'.

Deliberately altering copyright metadata is an offence under UK and US law.