Abstract: A security device for protecting a preselected article against theft, while nevertheless permitting the continued use of the protected article. The device includes: a desk top, table top, or the like for supporting the article; a frame structure fitted over and around the article, and, thereby, enclosing it; at least two anchor studs passing through the support and engaging the frame structure; and, a padlock for each anchor stud, with the shackle of each padlock passing through an opening in each stud, thereby preventing the removal of the frame structure. This security device is ideally suited for use as an anti-theft device in preventing the theft or unauthorized removal of easily removal peripheral computer equipment (e.g., a line printer, a video display terminal, and the like) which, while protected, must still be useable.