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good question 🤗
With permission from the owner, and proper notation that the content is not yours, should be fine. Permissions are extremely easy to obtain especially if you aren't using the content to make a profit. Just mail the owner, explain what you are doing and tell them if it's for profit.
yes, you can. but, give a copyright credit for their music or videos.
I think not, cause no rules in SoloLearn's Policy for that see https://www.sololearn.com/Privacy-Policy/
Just add "I dont own this music" and you are good to go. but since you are using it in code and non profitable purpose,I dont see any issue.
If your just using it for testing maybe copyright or royalty free content might be ok
It could even depend on countries/states: where you live, where servers situated, where you travel :-) :-/ And of course it depends on the licensing of that used content (Copyright, Creative Commons, Public domain, GPL, MIT, BSD... not sure if last three applicable for music/video/art, 'cause they were created for software first)
there are sites that are okay for non commercial use of their music, as long as you make note of who wrote it and where it came from. find one of those. some of the music is decent.