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Flattening refers to making all of the different text and images on the page into 1 single image. This ensures that if anyone were to bypass your PDF security, that they really wouldn't be able to do much with your resource (they won't be able to copy and paste any of the text images, just the single image you create for the whole page). I have yet to find a way to flatten that doesn't diminish the quality of clipart/text in some way, which is part of the reason I don't require my own clipart to be flattened. If you come across a method that results in better quality, please feel free to let me know so I can alter this tutorial!
First, in POWERPOINT, go to File-->Save as--> and change the format to a PDF.
Save it somewhere you'll remember. I always save to my DESKTOP.
Then, open it up in Adobe Acrobat Pro. If you don't have Adobe Pro, I'm not sure how you are securing your clipart and your text to prevent people from stealing it. I know it's a hard price to swallow, but believe me, having to go back and properly secure all of your products IS A PAIN. Even the newest teacher author that's only made $5 should be making it a priority to purchase it (especially if you're using clipart with a TOU that requires it).
Go to File-->Save As Other-->Image-->PNG.
Click Settings to change the DPI.
Change the resolution to AT LEAST 300 pixels/inch (you can scroll it down further to make it a higher dpi). But remember, the higher you go, the larger the file size will be, so keep that in mind.
Save. Now open up Adobe Acrobat Pro. Go to File-->Create-->Combine Files into a Single PDF.
You'll see this window.
Drag all of the images into the window and click Create File.
Now when you click your PDF you shouldn't be able to select any of the graphics/text, it should just click all as one single image (that's the flattened layer).
Now you have a PDF that's FLATTENED. Easy peasy! You are halfway there! Click below for the next step to secure!