Ruby on Rails

I want to protect certain images from download. Only authorized users
would be able to download them.

As I upload images with Carrierwave, they are stored inside
public/uploads/image. Users can download them via urls.

How can I protect images inside image folder so anonymous users can't
access them?
I know I can make before_action which wont allow anonymous user to
download it via download link but the image is still accessible if the
user knows path to the folder where are images stored.
pls help me to find a solution

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