The arrangements made by Band-in-a-Box, RealBand, and PowerTracks are yours, and your songs may be used freely as long as they don't infringe upon the intellectual property rights of others. https://www.pgmusic.com/salesfaq5.htm#23

The following add-ons are under PG Music Inc. copyright:

Band-in-a-Box demo songs
PowerTracks MultiTracks
Performance Series songs
MIDI Fakebooks (except the Sound Tracks MIDI Fakebooks)

For specific details on how copyright laws work in your unique region, please contact your local copyrights law office.

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From my own personal experience before I started working here, the YouTube bots can be a bit sensitive and flag videos for copyright that they shouldn't. It is a computer algorithm after all, and they are not perfect. From YouTube's standpoint, it is better to be overly cautious than not cautious enough. But if your video does get flagged for copyright, usually all that means is that you can't monetize the video. If you do want to monetize the video and it gets flagged, then YouTube has a process where you can dispute it. You would need to contact YouTube for more details on that process.

Best,
Chantelle