All these ebooks pdf collected from the Digital Library of India (dli.ernet.in).
The Digital Library of India is Hosted by: Indian Institute of Science, Bangalore in co-operation with CMU, IIIT-H, NSF, ERNET MCIT for the Govt. of India and 21 major participating centers.
Copyright Policy Notice From Digital Library of India
The copyright policy is as per the Indian CopyRight Act 1957.
All the books on DLI website are out of copyright, however, in case of a possible error in copyright checking, if the author or publisher sends a written request for removal, such a request will be validated and complied with.