Extendable protective arrangement which is intended, in the installed state, to protect a building opening against the effect of sun and other environmental influences and has the following features: a segment box having an inner wall and an outer wall, which are intended, in the installed state, to be directed towards the building interior and away from the building interior, respectively; having two side walls which are parallel to the reveal of the building opening and connect the inner and the outer walls (16, 18) to one another; and having a top wall and an extension-side base opening; wherein the segment box can be pivoted back and forth about a pivot axis, in an upper end region of the segment box, between a rest position and a position in which it is pivoted out by any desired angle α between > 0° and < 90° relative to the rest position; a number of panel-like segments comprising an uppermost and a lowermost segment (28a, 28c) and, optionally, one or more central segments located therebetween, wherein the uppermost segment is guided with sliding action in a displacement direction on the outer wall of the segment box, and the further segments (28b, 28c) are guided with sliding action in the displacement direction in each case on the segment located above, the uppermost segment and the outer wall and also in each case two adjacent segments can be displaced relative to one another over a certain displacement length which is smaller than the extent of the segments in the displacement direction; a first electric drive, which is connected to the lowermost segment via a traction mechanism and serves for retracting the segments into the segment box and for extending the segments out of the same; and a second electric drive for pivoting the segment box, together with the segments, back and forth about the pivot axis between the rest position and the pivoted-out position, characterized in that the segments, in a retracted position, are arranged in the form of a segment stack in the segment box and, in a closed position, in which they are extended all the way out of the segment box, overlap in an imbricated manner, and in that the uppermost segment overlaps the outer wall in a likewise imbricated manner, wherein lateral guide rails are present, which are intended for guiding segments at least partially extended out of the segment box in the rest position and are provided for fastening on the reveal of the building opening, wherein, in the installed state, the box-side, upper end of the guide rails follows the extension-side base opening of the segment box at least in a more or less flush manner. a segment box having an inner wall and an outer wall, which are intended, in the installed state, to be directed towards the building interior and away from the building interior, respectively; having two side walls which are parallel to the reveal of the building opening and connect the inner and the outer walls (16, 18) to one another; and having a top wall and an extension-side base opening; wherein the segment box can be pivoted back and forth about a pivot axis, in an upper end region of the segment box, between a rest position and a position in which it is pivoted out by any desired angle α between > 0° and < 90° relative to the rest position; a number of panel-like segments comprising an uppermost and a lowermost segment (28a, 28c) and, optionally, one or more central segments located therebetween, wherein the uppermost segment is guided with sliding action in a displacement direction on the outer wall of the segment box, and the further segments (28b, 28c) are guided with sliding action in the displacement direction in each case on the segment located above, the uppermost segment and the outer wall and also in each case two adjacent segments can be displaced relative to one another over a certain displacement length which is smaller than the extent of the segments in the displacement direction; a first electric drive, which is connected to the lowermost segment via a traction mechanism and serves for retracting the segments into the segment box and for extending the segments out of the same; and a second electric drive for pivoting the segment box, together with the segments, back and forth about the pivot axis between the rest position and the pivoted-out position,