i bought a website with lot's of content. Can I publish a book? Do I have the right?

So I bought a site with enough of unique content to make a small book or e-book. I bought it from the author, and he mentioned in the ad that he is selling author's rights for the articles along with the site. Do I have a right to make a book with this? Whose name do I put as an author? I don't want to put mine obviously since i did not write that. If his, will he get back any rights? Should I get his consent first?

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