Virtual Reality(VR) data in VR environment like manufacturing industries are often created jointly by many creators. It is then necessary to provide protection of the joint-creatorship and the creatorship of each participating creator. This paper proposes 3D Multiple Digital Watermarking Framework(MDWF) to solve the problem of joint-creatorship. The proposed framework, MDWF, makes use of 3D private multiple watermarking technology and efficient group key generation protocols for joint-creatorship verification. By using MDWF, each participating creator can prove his/her partial creatorship as well as joint-creatorship by MDWF. In addition, MDWF can solve the collusion problems because Group-Secret- Key(GSK) should be made by every users.