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Do you have to get permission from the book authors? Are there copyright problems with this sort of service?

I have a legal support, i don't break rules.

Oh no, I didn't mean you are breaking rules, sorry if it sounded that way. I was (am) just curious how this works, thats all.

No worries, it's ok. Summary isn't a book, it's like an article where we are describing what's inside using our own words.