I need to structure the response in sections: first, emphasizing respecting copyright and providing legal options. Then, maybe offer a content summary based on typical grammar books. If possible, suggest study strategies. Also, advise on how to verify if the PDF is legally obtained. Mention the consequences of piracy to make them aware. If they need a summary, outline common topics: parts of speech, sentence structure, tenses, common mistakes. But avoid reproducing any content from the book itself.