An advocate derives his power to practice law from two sources.
1) Advocate Act, gives power to practice before any court and Tribunal.
2) This right is fundamental right under Art 19 (g) of the Constitution of India. This right cannot be curtailed by putting unreasonable restrictions on advocates.
3) This right cannot be taken away without Due Procedure of Law
Vide N. K. Bajpai Case, 2012(3)Scale 452