Basically: live hacking of drones to take control of them.
Downside: it seems this works signature-based; leaving it open to non-recognized drones.
This post is also available in: 
עברית (Hebrew)
As drones are becoming an increasing threat, South Korea has been acquiring new counter-drone systems. Department 13 International has signed an exclusive distribution agreement with Korea Counter-Terrorism Solutions (KCTS), a leading distributor of counter-terrorism solutions in South Korea.
Their MESMER counter drone system is a non-jamming drone mitigation solution providing a safe and effective method of protecting personnel and infrastructure from dangerous drones.
The system was recently demonstrated in South Korea.
According to the company website, the counter drone system is a unique, patented, low power, non-jamming, non-line of sight, non-kinetic drone mitigation solution. It provides a safe and effective method of protecting personnel and infrastructure from dangerous drones, according to proactiveinvestors.com.au.
The key differentiator for the system is its ability to manipulate weaknesses in all digital radio protocols. This allows the system to put into effect sophisticated automated detection and mitigation strategies to stop, redirect, land or take control of drones across a range of national security and defense scenarios.
The technology is built on open source software architecture, which ensures that MESMER can be seamlessly integrated into existing security and surveillance systems.
from: https://i-hls.com/archives/82950
MESMER Counter Drone Solution
D13 recently announced that the US Department of defense had awarded an initial Technology Development Contract to develop specialized technology and products for a counter-drone solution.
MESMER Counter Drone Solution is a revolutionary commercial platform developed by Department 13 (D13). MESMER utilises sophisticated detection and mitigation strategies that automatically identify, stop, redirect, land, or take total control of a target drone or other radio-controlled device. MESMER RF protocol manipulation takes advantage of weaknesses inherent in digital radio protocols. MESMER’s flexibility allows it to operate as a stand-alone system, or to work in tandem with other hardware solutions. MESMER is designed for both commercial and defence/security organisations to deal with the emerging threat of autonomous systems. The counter-drone solution incorporates D13’s innovative technologies and extensive operational experience.
MESMER recognises unique radio signal features and other communication meta-data to select and apply strategies that curtail drone threats, unlike other systems that use radio jamming and standard electronic mitigation techniques. MESMER’s protocol manipulation is low-power, operating below 1 watt and within A/NZ regulatory (ACMA/RSM) constraints.
Low power is an advantage because it only affects targeted radiocontrolled devices — not non-targeted communication signals in the vicinity.
At D13, we understand that threats, constraints and user requirements will continuously evolve as drones, and other autonomous devices, are implemented in the real world. That is why, instead of a purposebuilt hardware solution approach, D13 has designed MESMER to use protocol manipulation to handle even the most complex scenarios. MESMER Counter Drone Solution provides our clients with a powerful and flexible counter-drone solution.
from: https://www.epequip.com/catalogue/unmanned-aerial-systems/mesmer-counter-drone-solution/