AK on Nostr: is it open source ??

{ "id": "5c0879e5c766e2a160ef46ec008e33c6e937ec9366022862fa623b19c151ec08", "pubkey": "3492dd43d496a237f4441fd801f5078b63542c3e158ffea903cb020a1af4ffdd", "created_at": 1693535180, "kind": 1, "tags": [ [ "e", "62e9bfaebb2b3f5bd5d750b08e758cddfa955f8d414d0b912e59caeb23c46728" ], [ "p", "e2ccf7cf20403f3f2a4a55b328f0de3be38558a7d5f33632fdaaefc726c1c8eb" ] ], "content": "is it open source ??", "sig": "4c15e11801cff02ebd25d76cbcdd3d61fef18252bd23b42db019531bfd94d7f5eb13d13a54c65c6f406003d8c5c2368885c44aa7e18d931c2f7c42be50b94a8e" }