Previewer Uploader Able to Download Files
When a link is sent with the access level set to "Collaborators Only" a "Previewer Uploader" Collaborator can then open the link from their email and have the option to "Open in App" and the IOS app will give them the opportunity to Download the File. The file can then be uploaded to Google Drive and then viewed on a desktop or mobile device. This basically gives the Previewer Uploader the ability to download the file.
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votes

We prevent this already.