It's OK for you to use our music, and it will never affect the availability of your video. You should be able to submit it to the contest! However, in the future, if you want to monetize your videos with our music you need to get a license. 
Hope that clears things up!
Hey Nathan! Our music is royalty free but you need to purchase a license to use it in your productions. Since you seem to be a YouTube creator, we suggest you should use our YouTube subscription.
You can even try a 30-day free trial here! https://goo.gl/HKzpEX
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