FLARM is encrypted:
So…
Article 6 of EU Directive 2013/40/EU[13] states that “[…] intercepting, by technical means, non-public transmissions of computer data to, from or within an information system, including electromagnetic emissions from an information system carrying such computer data, intentionally and without right, is punishable as a criminal offence […]”. “Information system” is defined in Article 2 as “a device or group of interconnected or related devices, one or more of which, pursuant to a programme, automatically processes computer data, as well as computer data stored, processed, retrieved or transmitted by that device or group of devices for the purposes of its or their operation, use, protection and maintenance”.
The Convention on Cybercrime has a similar text in its Article 3. The Convention on Cybercrime has been ratified by most signatory countries.