Patent ID: 7568742

Claim:
An anti-theft security device comprising: a case having a front case and a rear case pivotably connected to each other and receiving an information storage media in a space formed between the front case and the rear case; a hub formed at a center of an inner surface of one of the front and rear cases and to which the information storage media is detachably fixed; a separation prevention member inserted into the case through a side of the case and disposed between the hub and the information storage media by passing the separation prevention member through the hub across and over the information storage media fixed to the hub to prevent the information storage media from being separated from the hub; and a locking device selectively inserted along an insertion passage formed at a side of the case to prevent the separation prevention member from being separated from the case and to lock the case, the insertion passage comprising at least one engaging ring protruding from a side of the rear case the locking device comprising; a housing; a movable hook coming in and out of the housing and selectively locked to a catching step formed at one side of one of the at least one engaging ring; a slanted surface formed on an inner wall of the housing to be inclined downwardly; a movable body having a magnetism and resting on the slanted surface to ascend and descend with being contacted to an one surface of the movable hook; and a fixing member contacting to the movable hook to fix the movable hook to a locking position; wherein the movable hook selectively comes in and out of the housing as the movable body ascends and descends along the slanted surface.