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Our controls do not call jQuery using the link you have posted. Within Sitefinity the controls which use Sitefinity are using a version of jQuery which is embedded in our assemblies. The RadControls for ASP.NET Ajax suite also uses jQuery and it is also embedded into the dll. This means that when jQuery is loaded by Sitefinity or RadControsl it will be loaded as a web resource.
It seems that you either have this added as a script reference in your Script Manager or the script is loaded as a JS link from a user control. Please inspect your files to see where this js file is referenced.
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