Thanks for the info.

I'm not sure at what point something becomes a new format - after all using a container changes the apparent nature of it.

Another thing is the point at which one would say 'it has no DRM' - the fact that the thing isn't restricted as to opening and use doesn't necessarily mean there is no DRM , merely that no restrictions have been applied?

It's really a matter of semantics on both of those issues, eg if the file has capabilities for being managed but they are disabled, is it DRM-free? My attitude is that if it looks, walks and quacks like a duck...

But I take your point.

It's either managed or not managed regardless of whether it was capable of being managed.

You may regard it as management has been disabled.