From Custom Solutions of Maryland:
Click was developed to help you make screenshots. Although standard shortcuts prevent you from making screenshots while watching a DVD movie, this is not a problem for Click. You can take a screenshot manually by pressing Option-Command keys and also select automatic operation where a screenshot is taken periodically (one second to 10 minutes). You can select whether or not you want to hear a shutter click when screenshots are taken. Use VLC, not Apple's DVD Player, if checkerboard pattern is seen while playing DVD. Control Panel's location and settings (except for Automatic Screenshot checkbox checked state) are saved between sessions. Click may be used with one or two displays. Click is freeware.
What's new in this version:
Click Version 2.8.0 remembers the status of the Automatic Screenshot checkbox between sessions.