One of the still underappreciated informational rights is the right to reuse information. The causes of this situation are diverse. In part, it stems from a lack of public awareness regarding the significance of information held by public institutions. The primary aim of this study is to define the subject matter of the right to reuse and to provide a detailed discussion of those categories of public sector information to which the legislator itself devotes particular attention. This pertains to open data, research data, dynamic data, and high-value data. A detailed examination of these categories of information will enable a determination of whether public sector information constitutes the sole type of data subject to processes regulated by the Act of 11 August 2021 on open data and the reuse of public sector information.