Is 4k video downloader legal?

Related questions

1. How can I watch YouTube videos offline on PC?
2. Is mp4 audio better than mp3?
3. Are MPEG 4 and mp4 the same?
4. Is mp4 video or audio?
5. Why is mp4 the best?
6. What program can I use to play mp4 videos?
7. Which is better mp4 or MOV?
8. Why mp4 is the best?
9. Is mp4 free to use?
10. What are the disadvantages of mp4?

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