Err? India does have copyright laws...
Sorry to say but your comment about India not having copyright laws is utter non-sense and unfounded. Furthermore its highly doubtful that your hard work is not being rewarded because Google penalises sites for copying identical, it can take some time but it happens.
Scrapers use a range of online and local tools
Scrapers do not limit themselves to using Google to pick sites, they use a large range of tools, Bing, Yahoo, Google, Domain registration lists and so on.
Detect users in India using GEO IP
But if you insist to fight a worthless cause then you can use MaxMind or a free one with less IP's in their list Free GEO IP, using their API you can build a block based on region.
But wait, who does the scraping?
It should be noted... people who scrape, do not scrape data using their broadband connection, they use 100's of proxies on a wide range of IP address from all over the globe as Google throttles and blocks IP addresses that search too often. Also, scrapers won't limit themselves to
Google.in so that's a pointless idea to say the least.
Stop wasting your time with this idea
Blocking a entire country is silly and in fact near impossible because not all IP addresses return correct GEO information. Stop wasting your time with this ideology and go down the correct route of issuing a DCMA complaint to Google that then can remove the page from its index.