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For example, the arrow image is stored here: http://sstatic.net/so/img/vote-arrow-up.png . I wonder why not keep everything on local servers. What is the licensing aspects of those images? Can they be re-used by another party? is the license the same as for the content on SO sites?

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belongs on SO? –  perbert Sep 9 '09 at 20:54
    
What is so "Programming" about this question to justify posting it on SO? –  Andrei Sep 9 '09 at 21:45
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It's explained at sstatic.net ;-) –  Wim ten Brink Sep 10 '09 at 9:07

4 Answers 4

up vote 17 down vote accepted

We registered the domain sstatic.net for this purpose a month ago, and I’m pleased to announce that all the static resources for the Stack Overflow family of websites are now hosted at sstatic.net. This domain is of course cookieless and optimized for serving static content with the lowest possible overhead (and, as before, a far-future expires header, so zero requests are made to the server for cached static elements).

http://blog.stackoverflow.com/2009/08/a-few-speed-improvements/

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Since a lot of the images are the same between sites, having them all served from one domain allows the browser to cache them so that it doesn't have to get a copy from each site. It also helps take some of the load off the main servers by setting up a dedicated server for static content.

http://blog.stackoverflow.com/2009/08/a-few-speed-improvements/

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I should have thought to copy and paste part of the article instead of trying to write my own answer. I'll get you next time Gadget - er, TheTXI! –  Kyle Cronin Sep 9 '09 at 20:28
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Go Go Gadget Pony –  TheTXI Sep 9 '09 at 20:31

I believe it all still falls under the same copyright rules as the rest of the site.

site design and logo is © 2009 stackoverflow.com llc

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Static items are stored on sstatic.net to provide a better caching mechanism, reducing bandwidth consumption from the main sites. The rights to the images remain with SO.

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