Here’s a fictitious question: I have embedded a Flash movie in a PowerPoint presentation, and I would not like anyone to be able to save that embedded Flash movie from my PowerPoint presentation and use it elsewhere. And it does not seem doable — so are my Flash files really safe?
OK — yes they are reasonably safe only because many people are just not aware of that possibility, but remember that technology moves faster each day. There are indeed third party products that allow you to extract Flash content from PowerPoint files quite easily, and although these are not too well known or documented, they do exist.
So don’t assume those Flash movies cannot be extracted.
If you need a Flash movie that’s within a PowerPoint file, you can always request the creator of the presentation for a copy of the Flash movie. And just in case you created the presentation and lost the Flash movie, you can use the third party tools!