What is the technical details behind the JWplayer that IDM does not start downloading?

Question

It seems that Internet download manager (IDM) does not start downloading streaming vdieo through JWplayer (which are in fact small .ts files).

I thought it is becaue IDM is not working with .ts or small files so tried converting a sample mp4 into small .ts files and created a m3u8 and tried playing the video using video.js but IDM starts downloading a big ts file which merged all parts.

Is there a special technical protection in JWplayer or there is copyright or something else? Why IDM starts downloading when using video.js and not starts when using JWplayer?

this is sample m3u8 I used:

#EXTM3U
#EXT-X-VERSION:3
#EXT-X-TARGETDURATION:6
#EXT-X-MEDIA-SEQUENCE:0
#EXT-X-PLAYLIST-TYPE:VOD
#EXTINF:6.000000,
fileSequence0.ts
#EXTINF:6.000000,
fileSequence1.ts
#EXTINF:6.000000,
fileSequence2.ts
#EXTINF:6.000000,
fileSequence3.ts
#EXTINF:6.000000,
fileSequence4.ts
#EXTINF:6.000000,
fileSequence5.ts
#EXT-X-ENDLIST

and this is how I tried playing with video.js

<link href="https://vjs.zencdn.net/7.4.1/video-js.css" rel="stylesheet">
<video class="video-js" width="1280" height="720" data-setup='{}' controls>
        <source src="prog_index.m3u8" type="application/x-mpegURL">
</video>
<script src='https://vjs.zencdn.net/7.4.1/video.js'></script>

Answer 1

I found that the Internet downlaod manager won't start automatically when the website uses HTTPS instead of HTTP. After installing SSL both Video.js and Jwplayer are working same.