  The management of data and digital assets poses various challenges, including
the need to adhere to legal requirements with respect to personal data
protection and copyright. Usage control technologies could be used by software
platform providers to manage data and digital assets responsibly and to provide
more control to data and digital asset owners. In order to better understand
the potential of various usage control proposals, we collate and categorize
usage control requirements, compare the predominant usage control frameworks
based on said requirements, and identify existing challenges and opportunities
that could be used to guide future research directions.
