English term (edited): live area advert

Ref. 1: 'Live area, which is a common specification needed for magazine advertisements, is the largest allowable size for important information within the trim area. Magazines have to allow for some slippage when trimming down the final glued edged magazines. If you had important information (say a phone number) which as too close to the final size or trim area you run the risk of having that key "call to action" chopped right out of your advertisement. Knowing this, and the limitations of their bindery systems, magazines will include both trim and live area measurements in their specifications so that designers know to avoid placing important data where it may get trimmed off.'

Plaatje van 'bleed, trim and live area sizes' in ref. 2.

Ook wel 'type area' genoemd, zie bijv. hier:
http://www.landscapermagazine.com/advert_specs.html :
'Type area (also called Live area) is the area within the trim area where the type (or live information) should be contained within.'

Type area = zetspiegel (Van Dale).