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Continue to ChatQuery : How to make upload images harder to access from url? Possible Duplicate: How to restrict the download of all files in a folder? I am wondering how Facebook, Google+, Twitter and https://vmapp.org/query/87963/How-To-Make-Upload-Images-Harder-To-Access-From-Url-Possible-Duplicate-How-To-Restrict-The-Download-Of-All-Files-In-A-Folder-I-Am-Wondering-How-Facebook-Google-Twitter-And/