This article is from the FAQ, by with numerous contributions by others.
"No obligation to return [to India]"; also known as a "no-objection"
statement. Issued by the home government, through their
consulate. Issued routinely by most European countries, but
may not help a lot (see next question).
Comments by Andrei P. Kirilenko:
Well, strictly speaking, NORI means NOR to India (that produced
some misunderstanding when I talked with an attorney)