A device for securing a safety area around at least one automatically operating machine, comprising - a visible or invisible luminous marking (4; 5) arranged on or in at least one surface delimiting the safety area, by which luminous marking at least part of the safety area and/or at least part of a delimitation of the safety area is marked, a sensoric monitoring device configured for detecting a violation of the safety area, the monitoring device comprising a spatially resolving, contact-sensitive sensor system and/or a recording device for visual monitoring of the luminous marking of the safety area, - a control device configured for controlling the machine and/or for determining the safety area from an operating state of the machine and/or for controlling a shape, a structure and/or a location of the luminous marking (4; 5) and further configured for changing the operating state of the machine and/or for changing the operating mode of at least one light source (6, 7) and/or for triggering an alarm depending on a detection of a violation of the safety area by the monitoring device, a plurality of spatially resolved activable light sources (6,7) being arranged on or in the surface delimiting the safety area, each of the light sources (6,7) comprising an inactive and at least one active operating mode, the operating mode of the light sources being controllable by the control device, and the luminous marking (4; 5) being designed as at least one of the light sources (6, 7) in an active operating mode; characterized in that the operating mode of each of the light sources (6, 7) can be controlled individually by the control device. - a visible or invisible luminous marking (4; 5) arranged on or in at least one surface delimiting the safety area, by which luminous marking at least part of the safety area and/or at least part of a delimitation of the safety area is marked, a sensoric monitoring device configured for detecting a violation of the safety area, the monitoring device comprising a spatially resolving, contact-sensitive sensor system and/or a recording device for visual monitoring of the luminous marking of the safety area, - a control device configured for controlling the machine and/or for determining the safety area from an operating state of the machine and/or for controlling a shape, a structure and/or a location of the luminous marking (4; 5) and further configured for changing the operating state of the machine and/or for changing the operating mode of at least one light source (6, 7) and/or for triggering an alarm depending on a detection of a violation of the safety area by the monitoring device, a plurality of spatially resolved activable light sources (6,7) being arranged on or in the surface delimiting the safety area, each of the light sources (6,7) comprising an inactive and at least one active operating mode, the operating mode of the light sources being controllable by the control device, and the luminous marking (4; 5) being designed as at least one of the light sources (6, 7) in an active operating mode; characterized in that the operating mode of each of the light sources (6, 7) can be controlled individually by the control device. a plurality of spatially resolved activable light sources (6,7) being arranged on or in the surface delimiting the safety area, each of the light sources (6,7) comprising an inactive and at least one active operating mode, the operating mode of the light sources being controllable by the control device, and the luminous marking (4; 5) being designed as at least one of the light sources (6, 7) in an active operating mode; characterized in that the operating mode of each of the light sources (6, 7) can be controlled individually by the control device.