Like too many ppm of solvent vapor near a flaring pilot light, metadata is brimming with potential trouble as well.
Data about data. Metadata describes how and when and by whom a particular set of data was collected, and how the data is formatted. Metadata is essential for understanding information stored in data warehouses and has become increasingly important in XML-based Web applications.
The image here
Orientation of image: 1
File change date and time: 2013:02:18 19:43:06
Software used: Adobe Photoshop CS2 Macintosh
What sort of identifying info is passed along invisibly in files like images, videos, or music? A digital camera could potentially copy its serial number to every picture file and video. The serial number in turn is possibly traceable to a purchaser through billing information.
Maybe some whistleblower hackers out there scrutinize all the header information written to files for every product manufactured. Or not.