Aunshuman Pramanik ABSTRACT Intellectual Property rights are exclusive in nature. So, all the authors have right to exclude others, enjoy monopoly and claim copyright in their work. Similarly, each co-author can claim copyright over the joint work. Based upon the contributions and other factors co-authors can claim copyright over the joint works. This paper deals how to apportion or identify the shares of claim of each co-authors. The analysis of Equal Division rule and apportionment criteria...