This download setting is available for ebooks owned with the 3-user access model. You can choose to preserve 1, 2, or all 3 concurrent uses for online reading access. The following dropdown options are available:

Note: The "preserve reader access" settings are still applied to all 3U titles even when book-level permissions are set for specific titles. This means if you would like to disable downloading for most 3U titles but enable it for specific titles, you should not use the "Preserve 3-user reader reader access for All Users" option. Instead, you should set 3-user download days to 0 to disable download, and then use book-level permissions to set non-zero download days for the titles you would like to be downloadable.