The present invention relates to an interior-
mount protective
window covering system configured for tool-less installation from within a building. The
system includes a panel dimensioned to fit within a window frame and a plurality of securement members extendable from the panel to engage interior surfaces of the frame. Various securing mechanisms—including latch, lever,
cam, rod, and tube-based configurations—enable user actuation or passive deployment of the securement members. In certain embodiments, a threshold clamp engages a windowsill to enhance vertical retention when the window is closed. The
system is operable entirely from the building interior without requiring external fasteners, adhesives, or frame modifications, and accommodates non-uniform frame geometries via independent and adjustable securing mechanisms. The invention enables safe, rapid, and reversible deployment of protective panels for
storm protection, debris shielding, or
security enhancement, while preserving window
operability and aesthetics.