'Block blob url access

I could not find how video platforms such as youtube block access to the blob url address. enter image description here

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When I try to go directly to the blob url or send a request with fetch, I get an error. When the url is deleted, the video is gone. Since a video can also be downloaded from a blob address created on a video, I need to find out how platforms like this prevent this, but I couldn't find any resources. How to restrict access to blob url?



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