Unencrypted Private Keys (CoPay V3)

[ro-savage]

I've noticed that there are two private keys that don't appear to be encrypted when you encrypt your wallet.

From the localStorage:

{
  "coin": "btc",
  "network": "livenet",
  "xPrivKeyEncrypted": "{\"iv\":\"Jtu9SZ0Vy6euCYtzd+7sag==\",\"v\":1,\"iter\":10000,\"ks\":128,\"ts\":64,\"mode\":\"ccm\",\"adata\":\"\",\"cipher\":\"aes\",\"salt\":\"aEksVnYHSos=\",\"ct\":\"iAcUc4IX8Tnk5iLWHyObvr755Pqu+wUFyVSdKheWHb1fjTtV9VpsSGuc+ApmXdG3qweUzyftxwvSbB3q+KfnwtROB+TUDGd0cFGgWKABSK/4a/KsMh+TFauM+Ap/Tywc0skXlIPGUb+51tTtavrgmZ3hhCAxyUM=\"}",
  "xPubKey": "xpub6C3CK9BneEsAv5hexyiQDXZx8ge7ALjcEPUu4sk6QAxQDbXdS9RmuZEbjgaub6n4suUeDsADRiTrKY1cQtVGsLk6NgHDVFfecRUDC2184Hr",
  "requestPrivKey": "af29528a7cf85476aac50ad034ac30d902b0627ceb369da335daa1bfb75dff2b",
  "requestPubKey": "0258a2307053afe09b34ac6f85d208239f2c27a5b26edeb97144699403ed3f4d43",
  "copayerId": "81c3d49558c0039c21ce5f6d943eb922f0a7c7685d468747ede1a45fc6d05448",
  "publicKeyRing": [
    {
      "xPubKey": "xpub6C3CK9BneEsAv5hexyiQDXZx8ge7ALjcEPUu4sk6QAxQDbXdS9RmuZEbjgaub6n4suUeDsADRiTrKY1cQtVGsLk6NgHDVFfecRUDC2184Hr",
      "requestPubKey": "0258a2307053afe09b34ac6f85d208239f2c27a5b26edeb97144699403ed3f4d43"
    }
  ],
  "walletId": "d39510d7-3545-453f-8bf2-f29254050301",
  "walletName": "Personal Wallet",
  "m": 1,
  "n": 1,
  "walletPrivKey": "87786206eca33919c4446c1a3408a33b1cc6d055a5956f4f57a0182ac6259bbe",
  "personalEncryptingKey": "hse7I2MLoYf1Z+eIMiLoaA==",
  "sharedEncryptingKey": "9lthdBSG1+5J0vaLxAbwPg==",
  "copayerName": "me",
  "mnemonicEncrypted": "{\"iv\":\"gnVBeHwYZ9QKN4TN4dXEEA==\",\"v\":1,\"iter\":10000,\"ks\":128,\"ts\":64,\"mode\":\"ccm\",\"adata\":\"\",\"cipher\":\"aes\",\"salt\":\"aEksVnYHSos=\",\"ct\":\"TGoZRXNdTTJ1mlGVsVSzTtj8OoWWafuHAs+qj6SiZGCxnG7O5DprxpWrYmbMoBuO53Y/VVymfO5CqCVZIWd1E0wx3LW5lgzx2izdiXH3509kn12hhA==\"}",
  "entropySource": "427518abcc64e405ebed1ae5b2ac9e49575b75c6f98516c376f1ad1ab308dbd6",
  "mnemonicHasPassphrase": false,
  "derivationStrategy": "BIP44",
  "account": 0,
  "compliantDerivation": true,
  "addressType": "P2PKH"
}

They are
"walletPrivKey":"87786206eca33919c4446c1a3408a33b1cc6d055a5956f4f57a0182ac6259bbe",
and
"requestPrivKey": "af29528a7cf85476aac50ad034ac30d902b0627ceb369da335daa1bfb75dff2b",

Can you explain what these keys do and why they aren't encrypted with the wallet?