The Logic Pro and MainStage software license agreements state:

"Title and intellectual property rights in and to any content displayed by or accessed through the Apple Software to the respective content owner. Such content may be protected by copyright or other intellectual property laws and treaties, and may be subject to terms of use of the third party providing such content. Except as otherwise provided, you may use the Apple and third party audio file content (including, but not limited to, the Apple Loops, built-in sound files, samples and impulse responses) (collectively the “Sample Content”), contained in or otherwise included with the Apple Software, on a royalty-free basis, to create your own original soundtracks for your film, video and audio projects. You may broadcast and/or distribute your own soundtracks that were created using the Sample Content, however, individual Apple loops, audio files, sound settings, samples and impulse responses may not be commercially or otherwise distributed on a standalone basis, nor may they be repackaged in whole or in part as audio samples, sound files, sound effects or music beds."