Recording an audio system without a kernel extension

Question

Is there a way to record system sound without using the kernel extension in OS X. By system sound, I mean what is played through the speakers.

Looking around, I found that people are advised to do something similar to Soundflower, which uses a kernel extension to create a fake audio device. But, I really do not want to do this, and I do not believe that I should. Some on-screen recording apps seem to record system sound without a kernel extension (like Screenium) and they are distributed through the Mac App Store, making me think that there is a way to do this without breaking the rules of the app store.

I looked through the Core Audio and AVFoundation documentation, but I cannot find a way to get to system audio.

Thanks in advance.