Thank you for your valuable feature request!
We strongly suggest using the HTTPS CDN server
since HTTPS is used to ensure that the connection between the user's browser and the web server is encrypted.
Indeed, the benefit of the Subresource Integrity is that if the CDN server is tampered with malicious code, it will be delivered to the user, irrelevant if the connection is encrypted or not.
While it is not applicable for the old versions of the controls, because they are so many, we will definitely discuss the idea of introducing Subresource Integrity in a future release. I've logged the Subresource Integrity (CDN)
feature request in the feedback portal to see how popular this idea will become.
I also updated your Telerik points for the nice feature request.
Thank you once again!
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