After India's accession to the WTO, it must act according to international rules, and the previous one will not work.
So India revised the patent law and began to protect drug product patents, but India left itself a way out, that is, compulsory licensing and authorization restrictions on drug patents.
The so-called compulsory licensing means allowing developing countries to use the compulsory licensing system to produce patented drugs. To obtain a compulsory license, one of the following four conditions must be met.
(1) The copyright owner has not implemented or not fully implemented its patent.
(2) Compulsory license for the purpose of public interest.
(3) Compulsory license of anti-monopoly behavior.
④ Cross compulsory licensing of subordinate patents.