DISCLAIMER :) :)
Some of them may think it's not relevant for discussion as it does not fit here. Why not? As I think in StackOverflow we find smartest people around the globe. Even if I try to create in other StackOverflow domains it won't be that visible.
NOTE: So if your the kind of guy who is trying to pull this down. Please have some pity on me as I won't get good answers in other Q&A sites like Quora
我想了解像 UDEMY 这样的公司如何保护不允许下载的视频。我知道他们不能完全保护，但可以通过各种方法加固它。我发现的一些内容如下:
In Udemy I saw with point 3. Sounds interesting.
从基础开始
1. Disable right-click to download (Can be hacked by disabling the browser js).
2. You can use custom video libraries or no download options but god knows how fairly it plays. As I was able to download that kind of video.
3. Using BLOB URL for the video, this downloads the video in bytes. (Kind of secure using but can use HLS video downloader)
4. Can use On-demand live HTTP video streaming from Amazon or Vimeo but over time they may cost much price.
5. Then I read about large giants like Netflix, Amazon Prime uses multiple streaming files which will be stored in different chucks. Which makes it harder to download.
你们可能发现了任何其他有趣的方法来强化它，我们很乐意听到。
一天结束时，用户仍然可以屏幕录制您的视频 DAMMMMMM IT!
最佳答案
流媒体正在下载。如果您希望某人能够观看视频，则必须让他们下载该视频。
大型网站保护内容的方式不是通过下载，而是在下载文件之前对其进行加密。然后播放器知道如何从 DRM 服务器请求解密 key 。
有关更多信息，请阅读 Wikipedia 上有关 DRM 和 EME 的信息。
关于security - UDEMY 等公司如何保护视频不被下载，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/59452004/