How Copyright Owner Know My Information

vetbooks266 said:

I'm working on email for the other providers none of the above have my real information

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There are always some footprints when you make your website online and do its promotions. Normal methods of finding the website owner are mentioned above already, still there can be more ways for professionals/attorney and copyright claim helpers who usually claim for copyright issues. The niche you are working (books), is expected to have most issues related to copyrights, so the publishers are supposed to be ready with various tools and methods to claim their rights. There are various professionals who provide help in finding and claiming copyrights so you can try to know with them how they usually work (although they are not supposed to tell you their secrets).

If they file a police report against you or your company, they can receive your personal data from your hosting company.

if they know your rinfo I do not believe is a leak of info seems more likely like a will sue you, that is the only way I could thing they could get your details even if you are hidding them and they put some extra effort to make either an example or scare you to stop.

KalseoAgency said:

you can hide by doing domain privacy, some hosting companies offer free or minimum charges for it

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He has mentioned that he already did it but still they got his information.

Some domain registars allow to send mail to a domain owner by just writing the domain, without revealing it, or providing "encrypted" mail, for eg here : https://www.namecheap.com/domains/whois/result?domain=namecheap.COM you get a registrant email which redirect to their real mail.