Hey,
you can hide such things (how is probably something you need to ask google) for the non-technical users. But if some one wants to get the file he will definitely get it, even if you trying to hide the possibility. 
Just to name an example, YouTube has disabled / blocked the download of videos but you still can use browser extensions like the following to download those Videos:
https://addons.mozilla.org/en-US/firefox/addon/video-downloadhelper/