php - protecting video hotlink by one time url path. (vk.com in example) -

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how can protect videos hotlinking?

for example: http://vk.com/video215336036_165406371

when @ source code, vk.com provides one-time usage video path such

http://cs523402v4.vk.me/u215336036/videos/d436dc950c.240.mp4

you have directory inaccessible outside world have video files. have database table structure like:

videos --------------- id uri temp_url timeout

where uri location of real video file , temp_url random url generate. timeout field contains timestamp describing when temp_url expires , have generate new one. set timeout 5 minutes when generate new temp_url or 10 minutes. you.


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