You can play videos only on certain domains using Gumlet. Here are the steps to follow:
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Go to the Video Collections.
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Edit your collection and navigate to Video Protection
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Enter the domain that you want to allow to play your Collection of videos under the WhiteWhitelist Referrers.
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Read more about video protection here Video Protection
After that what will happen, the referer header will allow a server to recognize the page from where people visit it. With allowed referer settings, you can also ensure that your video is only accessible from a specific server/host. You can add multiple referrers using which you wish your video to be accessible.