If your script is set to "Discoverable", only approved industry executives, managers, and agents will be able to read your scripts. If you don’t want industry members to read your work, go to My Account, select "Security" and navigate to "Project Privacy". 

If your project is discoverable, other writers may request to read your project, but it's up to you whether you allow them to view it or not. If you do not want to grant access for a download, you can ignore the request.