libp2p/go-libp2p-kad-dht is an open source project licensed under MIT License which is an OSI approved license.
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Adding some details about IPFS here. IPFS is using libp2p and it is using specifically to find peers libp2p-kad-dht (https://github.com/libp2p/go-libp2p-kad-dht) which is library that implement kadmelia DHT (https://en.wikipedia.org/wiki/Kademlia).