[tuxor]

It's definitely necessary to get more information in this case. Otherwise the answers won't yield the expected information. If I ask you whether it's possible to eat bread that's wrapped in plastic you would also wonder what's the point. And if you would answer the question without asking for more information first, your answer would probably be: Yes you can eat the bread, if you remove the plastic first.

So my answers for zanzi would respectively be:
1. Yes you can, if you unpack the pdf first on the pc.
2. Yes, like in 1.
3. Yes, you don't even have to unzip those first: I guess you are talking about Epub, which is zipped html with jpegs and css files.
4. Officially no.

I guess that's not what he expected. But to be honest I still don't know what he is actually talking about. Reading zipped pdfs? Never heard of such a thing.