Until 2016, results of corporate responsibility in O2 Czech Republic a.s. have been included in the Annual Report verified by an external auditor.
Since 2017, results of corporate responsibility in O2 Czech Republic a.s. are reported Non-financial report issued under Para 32f and following of the Act. No 563/1991.Non-financial report amends the annual report verified by an external auditor.
In recent years, corporate responsibility passed the review and assurance by Ernst & Young LLP as part of the Corporate Responsibility and Sustainability Report Telefónica S.A., except for data on energy use which is audited internally. The aim was to show commitment to the 10 Principles of the United Nations' Global Compact throughout Telefónica report. The requirements of the Global Reporting Index (GRI) and the Dow Jones Sustainability Index were also followed.