Two recent articles from BBC Future deal with meta-data and possibilities of surveillance in two everyday technologies:

  • This article explains how photographs can have a unique fingerprint because of the camera’s sensor: “different sensitivities of the photosites creates a type of imperceptible image watermark. Although unintentional, it acts like a fingerprint, unique to your camera’s sensor, which is imprinted onto every photo you take.”
  • And another article explains how colour printers add dots — that are invisible to the naked eye —, representing meta-data about the printer to documents.