No License
Publishers: They can’t find proper licenses to protect their interests and express their requirements appropriately
Users: They don’t know where to find licenses and how to use datasets legally, which may reduce the dataset utilization rate
Custom License
Publishers: For the lack of a proper license, publishers have to establish custom licenses that require lots of time and resources
Users: It is time-consuming to learn numerous licenses customized for each dataset
License Not For Open Dataset
Publishers: Using a license not specific for open datasets cannot best represent their requirements and fully protect their rights, for those licenses might have controversies or loopholes
Users: Terms in varieties of licenses not specific to open datasets may confuse users