"Deepthi Publications" is a legitimate educational publisher based in India, primarily serving students in Andhra Pradesh and Telangana following the state board or intermediate education curriculum. Their Mathematics 1A textbook (typically for first-year intermediate/11th grade) is a copyrighted work. Downloading or distributing unauthorized PDF copies of this textbook without the publisher's explicit permission constitutes copyright infringement , which violates Indian copyright law (Copyright Act, 1957) and international intellectual property agreements.