A security assembly comprises a housing having side panels extending between a front panel and a rear panel, the housing defining a space for receiving an item, and edges of the front panel, rear panel and two side panels defining an opening of the housing; an EAS sensor; and a lockable security element having a first part comprising a latch mechanism and a second part comprising a pin, the first part being secured to the housing in a fixed position relative adjacent the opening of the housing, and the second part being moveable between an open position, in which an item is insertable into the housing, and a closed position, in which the second part obstructs the opening and a part of said item is clamped between the first and second parts of the lockable security element. The pin is moveable to extend through a portion of said item clamped between the first and second parts, and the latch mechanism is configured to releasably retain the tip of the pin.

A package for a product, a key retention system, and a retaining key utilize a closed relief slot in the retaining key to enable flexure of a retaining car on the retaining key during movement of the retaining key between locked and released configurations.