Counterfeit detection

A computer program product comprising:

• one or more computer readable tangible storage media and program instructions stored on at least one of the one or more storage media, the program instructions comprising:
• program instructions to identify a first light source in a surveillance coverage area, wherein the first light source is an electronic light source;
• program instructions to receive a schedule for one or more light source changes for the surveillance coverage area, wherein the one or more light source changes include activating and deactivating the first light source at a particular point in time;
• program instructions to establish a first shadow measurement utilizing the first light source and a surveillance camera at a first point in time;
• program instructions to determine a second shadow measurement utilizing the first light source and the surveillance camera at a second point in time;
• and
• program instructions to, responsive to determining the second shadow measurement does not reach a similarity threshold with the first shadow measurement, send a first notification to a user, wherein the first notification specifies a potential security breach.

A computer system comprising:

• one or more computer processors;
• one or more computer readable storage media;
• and
• program instructions stored on the computer readable storage media for execution by at least one of the one or more computer processors, the program instructions comprising:
• program instructions to identify a first light source in a surveillance coverage area, wherein the first light source is an electronic light source;
• program instructions to receive a schedule for one or more light source changes for the surveillance coverage area, wherein the one or more light source changes include activating and deactivating the first light source at a particular point in time;
• program instructions to establish a first shadow measurement utilizing the first light source and a surveillance camera at a first point in time;
• program instructions to determine a second shadow measurement utilizing the first light source and the surveillance camera at a second point in time;
• and
• program instructions to, responsive to determining the second shadow measurement does not reach a similarity threshold with the first shadow measurement, send a first notification to a user, wherein the first notification specifies a potential security breach.