Block downloads for view-only files in SharePoint and OneDrive
https://support.microsoft.com/en-us/office/block-downloads-for-view-only-files-in-sharepoint-and-onedrive-6051184b-62ac-4149-b874-13dcd40ef91e
WEBBlock download is available for view-only sharing links to Office documents and other file types, such as PDFs, images, audio, and other non-text and non-video file formats. When you select Block download, people who access the file you shared won't see options to download, print, or copy the file. They can only view the files on the web, and ...
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