In my answer here, I posted PDF's of most of the volumes of the 10-volume Motilal Banarsidass translation of the Padma Purana. I was able to get volumes 2-8 from two sources, DSpace (the digital repository of the West Bengal Public Library Network) and the Digital Library of India, both of which are government websites. Now I also found links to volumes 1 and 2 on the internet, but here's the problem: they're just on random websites, so I'm not sure if these links infringe on copyright. And the Stackexchange Network's Terms of Service says this
Subscriber represents, warrants and agrees that it will not contribute any Subscriber Content that ... infringes, violates or otherwise interferes with any copyright or trademark of another party
So I'd like go find out whether this book is still under copyright, or whether it's in the public domain. Here is a link to the book's description, if that helps. The book was originally published in 1951, so maybe the copyright has expired by now. Also, as I mentioned above certain volumes of the book are accessible through the Digital Library of India, which claims to be in compliance with the Indian Copyright Act of 1957.
In any case, does anyone know anything about Indian copyright law? In America, books published before 1923 are in the public domain. What is the cutoff for Indian books? I'm not just asking because of this one book; in future I expect to post PDF's of many other scriptures on Hinduism.SE, so I'd like to know how to determine the copyright status of an Indian book.