Taking sourcing decisions and implementing sourcing models in relation to IT services is an interesting area of theoretical as well as empirical research in the field of IT management (including service management and IT project management). It is connected with many important issues, such as: management of the organization's resources in the era of globalization and enterprise virtualization; development and improvement of IT; the impact of sourcing relations with IT service providers on innovation and increase of companies' competitiveness. The aim of the article is to indicate current trends in the practice of enterprise IT management and to define the determinants of decisions regarding the implementation of sourcing models connected with the implementation of IT services using global resources, with particular emphasis on information security aspects. Based on the analysis of literature, personal experience and previous publications, the Authors discuss the essence and reasons for IT sourcing, trends in sourcing of IT services, socio-economic conditions for the relocation of IT services, threats related to the relocation of IT services and its impact on information security.