I'm trying out the Office 365 Public CDN feature as described here
But I'm interested in what is "Public" about this. Towards the bottom of the article these is this answer in the Q&A:
Can I use this CDN from outside of SharePoint Online?
No. There is referrer limitation on the CDN URL requests. You can only reference assets from the CDN URLs when request is coming from the SharePoint Online.
This seems to suggest the files can't be accessed from outside of SharePoint Online.
So does this mean any authenticated user in my tenant has read access to the files in the CDN? Or any user in ANY tenant has read access (the "public" bit)?
Also, does anyone know if I enable CDN on a document library that's being used as an asset library that I'll need to update all my URLs? This seems to suggest I may not by now:
Notice. During developer preview, you will need to explicitly update the URL of shared assets in the pages and in the customizations to match CDN URL addresses. We are however working on doing this automatically with updated version, which is planned to be available later this calendar year before full worldwide release.