Mark an Asset as Downloadable or non-Downloadable

You can prevent users from downloading  assets by marking the asset as non downloadable in the advanced rights section during upload or batch editing. When an asset as marked as such a users can see a preview of the asset with the watermark applied but cannot download the asset. They also cannot request access to download the asset. This can be useful if, for example, you have new assets that should be previewed to all portal users but nobody should have access to download the files. 

Only users with the permission download non-downloadable will be able to download the asset.