YouTube: Some official channels host the movie for rent or purchase in specific regions.
is an unauthorized, high-traffic website and mobile application used for streaming and downloading pirated Tamil, Telugu, and Hindi movies. Full cast & crew - Aadukalam (2011) - IMDb
Starring Dhanush as Karuppu, Taapsee Pannu (in her Tamil debut) as Irene, and V. I. S. Jayapalan as Pettaikaaran.
Amazon Prime Video: Depending on your location, the film may be available as part of your subscription or for a small rental fee.
If you love Dhanush’s performance, if you want to see the raw Madurai dialect, do the right thing. Rent it, buy the DVD, or subscribe to a legal service. Do not let the legacy of a National Award-winning film live on a pirated server hosted in a foreign country.