Abstract It is now apposite to speak of the ‘data centric world’. Businesses are paying ever more attention to their own, and others’ data, as a way of adding value to the organisation and conferring competitive advantage. This in turn is focusing attention on legal rights in data across many business sectors, where we’re starting to see more disputes. Data is funny stuff in and of itself – effectively inert in legal terms. It is more precise to speak of ‘legal rights in relation to data’. Those rights are IP rights - copyright, database right, confidentiality, patents and trade marks – and contract rights. Each IP right has its own rules, and applying those rules to data leads to a complex, multi-layered analysis where the law is unsettled and uncertain. This means that data is an area where contract is very often king, so most businesses regulate access to data by means of a series of agreements. The most commonly contested points in negotiations are around licence scope, derived data, commingled data and post term use.