In today’s knowledge economy, intangible knowledge assets have become the key drivers of organisational success. Protection of intellectual properties for all parties is a challenging issue in cloud manufacturing environment. This paper focuses on the protection of intellectual property in the cloud manufacturing environment. Several strategies for protecting intellectual properties are proposed in this paper. In addition, a privacy enhanced business interaction mechanism is presented. Furthermore, this paper discusses some practical technologies in the cloud context. © IFIP International Federation for Information Processing 2015.