GM patents security label technology

General Motors' subsidiary GM Global Technology has been granted a US patent on what it describes as an improved security label.

The patent describes a label with multiple security layers, including a pattern of dots that provides a unique identifier - disguised as an imperfection on a printed label - and also includes raised dots at a specific location that can be used to verify the label by touch.

Counterfeiters who seek to copy labels will overlook or remove the motif, law enforcement personnel or other investigators "can be trained to carefully examine a suspected counterfeit and to look for the presence or absence of the small dots."

The full text of the patent appears below: