The Chamber of Deputies has passed an amendment to the Electronic Communications Act. This brings fundamental changes to the use of cookies on websites. Although the law is still awaiting the president’s signature, it is likely to come into force on January 1, 2022. What does this mean and what needs to be done before then?

What exactly is changing?
Until now, the Electronic Communications Act has applied the opt-out principle, which means that when a user visits your website, you notify them that you use cookies, but you start using them immediately after they arrive on the website. Typically, this takes the form of a banner stating “This website uses cookies. By using this website, you agree to this practice.”

Users will now be required to give their explicit consent to the use of cookies, e.g., by clicking on the “I agree” button, etc. Only then can cookies and other similar technologies be used. This is how the idnes.cz server handles consent:
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Notes:
- The law also applies to similar technologies, such as browser storage, etc. It is therefore not possible to simply replace cookies with another technology that stores data on the user’s computer.
- The law does not apply to technically necessary cookies, such as those required for logging into a service or saving an e-shop shopping cart.
What does this mean in practice?
Cookies are used by many tools on the web. These include, for example:
- measurement tools – Google Analytics, Hotjar, Smartlook, etc.,
- remarketing platforms – Google Ads, FB pixel, Sklik Remarketing, etc.,
- conversion codes – Google Ads, FB pixel, Sklik Remarketing, etc.,
- affiliate measurement codes – CJ, AffilBox, etc.,
- chat tools – SmartSupp, etc.,
- videos embedded in websites – YouTube, Vimeo, etc.,
- social media buttons for sharing or commenting – FB like box, etc.,
- and more.
All these platforms and tools will need to be modified so that they do not use cookies without users’ consent. If you manage a website or e-shop, you will almost certainly have a lot of work ahead of you.
However, in addition to the technical adjustments themselves, the change will have other consequences. Some users will not give you their consent to use cookies (and you can assume that this will be more than 50%, which will have further consequences), and some of these consequences can already be predicted:
- Drastic reduction in the performance of remarketing and RTB campaigns – you will not be able to target remarketing ads to users who have not given their explicit consent. In practice, this could be half of all users in the best-case scenario. Operators are trying to work around this, e.g., AdFom has introduced the concept of First-Party ID.
- Inaccurate data in Google Analytics – even without cookies, you can run Google Analytics code, but users without consent will appear as single-page visits (bounces). Each additional page will be considered a new visit and a new user. It will therefore be quite difficult to evaluate conversion measurements even within sessions, and multifunnel will be almost impossible.
- The end of campaign evaluation in marketing platform interfaces – the number of conversions recorded in conversion codes (Google Ads, Sklik, Heureka, Zboží, etc.) will be significantly distorted. Data for campaign optimization will be difficult to use in platforms.
- Impact on affiliate platforms and their partners – they use cookies to credit the commission to the partner who brought in the conversion. So, in the best case scenario, partners should lose 50% of credited conversions. We expect them to switch to a different method of crediting conversions, such as using discount codes.
The problem with campaign evaluation
Google Analytics will have a problem with data in terms of how conversions from individual sources will be evaluated. Let’s imagine a situation where a user comes to the website from Google/CPC, browses through four pages, and makes a purchase on the website. This may now look something like this:

Now (with cookies), we can see in GA where the user came from and how much they spent during that visit. But what will happen during the consent period? Let’s take two examples:
User does not give consent
In the same case where we display a cookie bar on the home page to the user, but the user clicks “I do not agree”:

Google Analytics sends pings to the server, which carry information about whether consent has been given or not. If I don’t receive cookies, the entire session will not appear in Google Analytics.
The user gives consent on the second page
Okay, but what happens if the user agrees, but not immediately on the first page?

In such cases, we still lose information about the original source. Consent must therefore be obtained as soon as possible. If the user does not give consent on the first page, this will have a significant impact on campaign evaluation.
Google Analytics 4 can partially fill in the gaps in the data—for conversion tracking, it can assign some conversions to their sources based on conversion modeling estimates. Data on visitor behavior (which pages they viewed, website flow, etc.) will be missing. In Universal Analytics, all data will be missing.
Co je třeba udělat?
Čeká vás určitě několik základních kroků
- Mapování – je třeba si sepsat, jaké vlastně používáte nástroje a jaké tyto nástroje využívají cookies. Dále je třeba sepsat si interní procesy, které využívají tyto nástroje, a popsat jak se jich úpravy dotknou.
- Nasazení nástroje pro sběr souhlasů – můžete vybrat nějaký z existujících (většinou placených) nástrojů, nebo vytvořit vlastní.
- Technická úprava měření a marketingových platforem – bude třeba upravit spouštění marketingových platforem tak, aby respektovaly souhlas uživatele. Pokud používáte Google Tag Manager, bude to pro vás jednoduší. Pokud ne, doporučujeme s tím začít.
- Technická úprava webu – typicky se jedná a videa vložená na vašem webu, FB a jiná sdílecí tlačítka apod., která vkládají do webu přímo vaši programátoři. Bude třeba, aby to nedělali. A např. místo videa zobrazili statický obrázek, video pak načítali teprve po kliknutí uživatele.
- Úprava procesů – optimalizujete kampaně? Děláte reporty z Google Analytics? Zamyslete se nad tím, jak toto budete dělat nově.
- Papírování – doporučujeme při této příležitosti revidovat, jestli máte uzavřené smlouvy se subjekty, které zpracovávají vaše data (nebo k nim mají přístup).
What needs to be done?
There are several basic steps you need to take
- Mapping – you need to write down what tools you actually use and how these tools use cookies. You also need to write down the internal processes that use these tools and describe how the changes will affect them.
- Deploying a consent management tool – you can choose one of the existing (mostly paid) tools or create your own.
- Technical modification of measurement and marketing platforms – you will need to modify the launch of marketing platforms so that they respect user consent. If you use Google Tag Manager, this will be easier for you. If not, we recommend you start doing so.
- Technical modification of the website – typically, this involves videos embedded on your website, Facebook and other sharing buttons, etc., which are embedded directly into the website by your programmers. They will need to stop doing this. For example, instead of a video, they could display a static image and only load the video after the user clicks on it.
- Process modification – do you optimize campaigns? Do you generate reports from Google Analytics? Think about how you will do this in the future.
- Paperwork – we recommend taking this opportunity to review whether you have contracts with entities that process your data (or have access to it).
Don’t wait!
The regulation comes into effect on January 1, 2022, and setting up cookie bars is not a matter of a few minutes’ work. It will also take you some time to experiment and test how the data collected in the new way will look and which cookie bar formats bring you the highest opt-in rate. Get started as soon as possible!