Ask HN: Is Apple audio copyright protecting locally on iPhone devices?

I recently edited a video in Adobe Premiere with my Macbook, and used a Kanye West/Jay Z mp3 downloaded from youtube.

The audio track plays fine locally on my Macbook, but when I uploaded it directly to Facebook, I found that the audio had been modified to only loop a sample of the song. I suspected Facebook was doing some copyright protection, so I just deleted the video.

I thought I could get around it by uploading to Streamable.com and sharing that on Facebook. What I then learned was:

- The music played fine if you were viewing from a PC on Streamable.com

- But music was stripped and only looped a sample if you played from iPhone from the Streamable website. Exactly the same as Facebook had done.

Here is the video URL if you'd like to test: https://streamable.com/pk3b

Interesting, I then thought Streamable could be implementing the same sort of copyright protection.

So I transferred the .mp4 video file directly from my Macbook to my iPhone via Airdrop.

The audio was once again stripped from the video and looped only a sample! Something is going on, the iPhone is refusing to play the audio in the file as is. Any ideas on how or what Apple is doing here?

I'm currently also in Thailand, my friend from New York says the audio is fine on both pc and iPhone.

I tested it on other iPhone devices here, and they had the same issue