Is there a way to download all content from a collection at once? Instead of browsing an article for its download to start.
New option added about two weeks ago allows this.
It's a collection-level option, set it in the collection properties: "Allow user to save collection to their device" -- feature term is "Explicit Downloads"
Read more here: Digital Publishing Solution Help | What's new in this DPS 2015 release
DPS has never supported DRM for content, either in the classic product or with DPS 2015.
Any suggestions for DRM? Security?
It downloads the same thing that gets downloaded when you’re just browsing through the app: .article files. They’re stored locally, and they are not secure.
What kind of files does it download when it is saved to device? what kind of security do the files have?
Yes, you have to rebuild your apps.
Do we need to rebuil an app for this feature to be active in a current PreviewApp? changing this setting in collections does change anything in may case, the "Dwld" button doesn't appear.