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so we are back with our PDF which is the source of the book we want to to transform and before going inside the transformation so you saw the UB how it looks to the user when you open it in in an UB reading uh software now so this is the UB file I showed you in a the software now I will show you what is inside uh this EP so what is exactly a niub what is it standardized in this file format what is not the standard and so on so the first thing I can do is to duplicate it and to rename it as a zip file so first thing you can see is UB itamp;#39;s only a zip file so itamp;#39;s a itamp;#39;s a container for for a lot of files we will see soon but itamp;#39;s only a zip container for those file so you can unzip it with any uh usual software so of course it works because itamp;#39;s a nonprotected uh UB if you have some DRM some copy protection you cannot do like like I did but itamp;#39;s still a zip file so now you can see itamp;#39;s really what is the the structure set by the sta