Yellow Exclamation Marks?

This is probably something very simple which i've somehow overlooked, but on the 'games list' in the arcade admin menu, I see small yellow exclamation mark graphics alongside some of the games in my arcade.

They are in the category column. Any ideas? I'm sure the games still work fine, but the graphic has worried me a little Help will be greatly appreciated, thanks!

--------------- Added [DATE]1240858629[/DATE] at [TIME]1240858629[/TIME] ---------------

Nevermind, i've just found the answer in another thread! Whoops Thanks anyway.

[Stifmeister2]

Those are v32 or v33 games. In other words, "secure games".