This depends on the access settings of a dataset:

• Open data can be accessed and downloaded without prior registration by anybody.
• Restricted data can only be accessed after registration (via DARIAH) and login with your institutional username and password, and only after the data owner provides access.
• Metadata only datasets usually include sensitive information and are not accessible. Only the metadata and the description of data collection are available online. Some datasets are only personally accessible on site at the archive of the Research Centre for East European Studies at the University of Bremen.