I bought an eBook from iTunes. I can view/read it perfectly on my iPhone but when I try to open the eBook file on my iPad, I get the error message, "Cannot open book. This book is protected by an incompatible technology." Any ideas for me? thx

i bought an eBook from iTunes. I can view/read it perfectly on my iPhone but when I try to open the eBook file on my iPad, I get the error message, "Cannot open book. This book is protected by an incompatible technology." Any ideas for me? thx

Welcome to the Apple Community.
I have seen previous versions mentioned in a pop up message before on iCloud.com, but I'm not really sure at all how it would help, as I couldn't get it to do anything.
The best advice I have at this time is to back up your work on your iOS device by regularly saving it to iTunes, if anything goes wrong you can then either load it into the numbers app again on the device or recover it via iTunes on your computer.
My syncs are immediate, I never get chance to see if it works in the background, sorry.

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