Probably talking about RISUG, although the US equivalent is Vasagel.
Basically Vasagel plugs up the Vas Deferens so sperm can't get out, and RISUG rips sperm to shreds as they come out. It lasts for 10 years, and is reversible with a shot of baking soda.
RISUG is approved in India (where it was developed), and Vasagel is being developed by a foundation instead of a pharmaceutical company, so progress has been slow.