.svn folders in theme

A zipfile that contains a theme, has .svn folders init. These .svn folders are also placed in the deployment directory. It looks like these .svn directories have no use in the deployment, because after deleting them, the theme still works properly. Having .svn folders in a deployment directory can be seen as a high vulnerability risk. I wonder what's the purpose of the .svn folder. At the moment the .svn directories are deleted manually to prevent the risk.
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