What is the ruling on purchasing a religious book and publishing its content online to disseminate its benefit?

It is permissible to publish books that are not copyrighted. As for copyrighted books, it is not permissible to publish them without the permission of their owners, because publishing rights are protected. It is permissible to publish small excerpts from a book for the purpose of quotation, while attributing the material to the author, even if no permission is obtained, provided that accuracy in نقل (transmission/citation) is observed. Emphasis must be placed on publishing reliable books by authors known for the soundness of their methodology and the correctness of their belief.