title: What is the concept behind Video Distribution Services?
body: <p>I came across quite a few video distribution services (one is heyspread). The video they have on their home page is like, you upload your video only once and it is distributed to other video sharing sites. To me, it looks like they have coded it in Php.</p>
  
  <p>Can anyone explain me the logic behind it? How is possible? Also, will it take the bandwidth of uploading it only once or uploading it to all the sites that we are using?</p>
  
  <p>Also, if I had to code one like that, are there any links which I can use as a start up to kick off?</p>