Hi, and thank you again for all your answers
@DNSB : what do you mean by sideloaded? (I'm sorry, but English isn't my native language). If it is not possible to convert, I'll use the DRMed file with Thorium on Windows. I've seen a Readium toolkit exists for Android in a repository. Is there a recommended app (I've read about Lea reader)? Although, it's sad to buy an e-book and not being able to use it as I want
@BetterRed : I successfully read it with Thorium. I'd like to read it on Android too and if possible sync between the two devices

. I don't understand the use of the #admintag?