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This isn't so much a security feature as it is a video acceleration feature called overlay. If the application such as WMP were to draw the video to the window, then the stuff on the window would then have to be drawn through the video card. With overlay, WMP can simply fill it's window with one color, and then pipe the video directly to the video card. The video card then just draws the video where the pixels are that color. One neat trick you can do with this is find something with that same special color, such as that screenshot, and hold it over a video. You should be able to see the video through the screenshot.
Usually you can disable this overlay feature by finding the video acceleration setting, and turning that all the way down.
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<div style="float: right; width: 100px; height: 70px; margin: 5px 15px;"><img src="http://madskills.org/monolith/idleserver.gif" style="width: 98px; height: 65px;"><img src="http://madskills.org/monolith/theserver.gif" style="width: 98px; height: 65px; position: relative; top: -65px;"></div><div style="margin: 0 3em; font-size: 80%; font-style: italic;">Love is patient, love is kind. It does not envy, it does not boast, it is not proud. It is not rude, it is not self-seeking, it is not easily angered, it keeps no record of wrongs. Love does not delight in evil but rejoices with the truth. It always protects, always trusts, always hopes, always perseveres.</div><div style="text-align: right; text-size: 80%;">1 Corinthians 13:4-7</div>
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