适用于YouTube的Azure媒体服务定位器，例如视频发布

I am creating a site that will have viewing capabilities similar to YouTube. So far, I am able to upload videos to azure media services but I seem to be confused about how to allow access to the video, to my user base. I am using javascript chunking and I am generating a write based SAS Url for uploading the video to and this part works. 1) Should I remove the write locator after the file is uploaded to prevent someone else from having write access to the file? 2) It seems like I would want to grant some kind of perpetual access to the video for my usership. Is there a way to restrict access to only the site domain? Also, it the locator per user or does it actually expire period once the expiration time is reached? I am creating a site that will have viewing cap