Can I use my neighbour's wi-fi in Czechia?
Not without the owner's consent — a missing password is not an invitation. Criminal Code § 230 punishes unauthorised access to a computer system: joining a network nobody made available to you is formally criminal even when it is unsecured. Borrowing the signal once will in practice end in a warning, a misdemeanour or a civil dispute — but once damage appears (drained data, illegal files downloaded from the owner's IP address), it turns serious. And that is the part people overlook: whatever you do on someone's wi-fi lands on the owner first. Fine are public hotspots (cafés, city networks — meant for the public) and the neighbour's network with their consent. Cracking the password is criminal, no debate.
📋 The rules
- Someone's network without consent: unauthorised access (§ 230)
- Unsecured ≠ consented — an open home network stays foreign
- Public hotspots: meant for the public — fine
- The neighbour's wi-fi with consent: legal (even for a contribution)
- Breaking security: always criminal
🔓 Exceptions
- Networks explicitly labelled free/guest wi-fi
- In-house sharing by agreement (flatmates, family)
- The neighbour's network you have consent to use — a contribution to their bill is fine
⚠️ Penalties & fines
Unauthorised access to a computer system carries up to 2 years in its base form and gets worse with damage or data misuse. Practice is milder: minor cases end in a warning or a misdemeanour, and nobody goes to prison over one evening on a neighbour's wi-fi. The real trap is elsewhere — the traffic is billed to the network owner, so an investigation into illegal downloading starts at his door and works back to you through the logs. The neighbourly relationship usually ends there. Breaking the security (WPS-style attacks) has no grey zone at all: it is a crime regardless of what you did next.
📎 Official sources
- Živě · Wi-fi and the law — advice (CS) →
- Diit · May you join an unsecured wi-fi? (CS) →
- ePravo · Public wi-fi networks and the law (CS) →
❓ Frequently asked
The network has no password. Isn't that a public offer?
No — an unsecured home network is still someone else's system, and a missing password does not replace consent. Public offers are only hotspots meant for it: cafés, city networks or labelled guest wi-fi.
What realistically happens for using the neighbour's signal?
Formally § 230, practically a warning or a misdemeanour. The indirect risk is worse: anything illegal from that network hits the neighbour first, and investigators then trace it back to your device anyway.
May I share my wi-fi with a neighbour?
Yes, by agreement — though providers sometimes restrict it in their terms, so read the contract. With an open network you carry the risk of other people's traffic: liability is looked for at the IP holder first.
May I boost a public hotspot with an extender?
For public networks yes, within the operator's terms. For private networks no — an extender changes the range, not the law; it is still access to a system nobody made available to you.
Someone is using my wi-fi. How do I defend myself?
Secure the network with a strong password, change the router's default login and check the list of connected devices. It is in your own interest: traffic from your network is attributed to you as the owner first.
🔎 Common searches
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