iDNES, a part of the Czech media group MAFRA, a.s., has clarified how it uses user data for targeted advertising across its network of websites, including iDNES.cz, Lidovky.cz, Expres.cz and Antiyoutuber.cz. The company explains that if users choose to give consent for targeted advertising instead of paying for a subscription, they will see both targeted and non‑targeted ads on the aforementioned sites. Targeting is based on profiling of users’ online habits and interests, derived from data collected about their internet activities. The purpose is to display advertisements that are relevant to each user. MAFRA, together with 125 advertising partners, processes the data. Users can withdraw their consent for targeted advertising at any time. If they do so, they will be prompted to switch to iDNES Premium, a subscription service that removes ads. Consent for other purposes, such as displaying content tailored to interests, can be changed or withdrawn without requiring a subscription. Certain data, not used for ad targeting, are processed on the basis of legitimate interest. Users can object to this processing and adjust their privacy settings in the “Detailed Settings” section. Settings applied here affect all four websites mentioned. The data processing activities include: using limited data to select ads, creating profiles for personalized content, measuring ad performance, understanding audience through statistics, and technical site operation. If a user opts for the free version of iDNES and consents to targeted advertising, the consent applies to all the purposes listed above. Because of technical constraints on the advertising providers’ side, users who do not want their data used for certain purposes—such as creating profiles for personalized content, measuring content performance, or technical site operation—must explicitly indicate their objection in the “Processing of data by the publisher and other partners” section. If they do not, the company will not process data for those purposes. The notice also notes that a few special advertising formats, such as commercial messages or self‑promotion by the company and its subsidiaries, are difficult to remove from content. Users can set preferences separately for other company websites, but if they give consent for targeted advertising on those sites, it is assumed that they have also consented for the four main sites.