The service stores data about registered users in the portal. This is necessary to allow only the right users access, and to process service requests. Example of data is name, organisation, national identification number (”personnummer”) and email address of users who are registered in the portal. The data is used for handling signature requests, and may also appear in the service's internal logging data. If users upload PDF documents with personal data, Nexus temporarily handles these PDF documents for the purpose and time period that is necessary to perform the signing operation.