...India.31. The learned Senior Counsel submitted that assigning of a PI is a well-defined concept and, referring to the judgment of this Court in Vodafone International Holdings BV...subsidiary, Cairn UK Holdings Limited. Upon its acquisition of 50%, Shell's interest under the contract, CEIL became the operator under the operating agreement with effect from 1-1-2000...subsidiary, Cairn UK Holdings Limited. Upon acquisition of 50% of the Shell's interest under the contract CEIL became the operator under the operating agreement w.e.f 1-1-2000. Cairn later announced on 16...