"golden master" meaning in English

{
  "forms": [
    {
      "form": "golden masters",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "golden master (plural golden masters)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "gold master"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "2009, Gary L. Reback, Free the Market!, Penguin, →ISBN:",
          "text": "Microsoft had just released its “golden master,” the production disk that computer manufacturers used to install Windows 95 on every personal computer they sold.",
          "type": "quote"
        }
      ],
      "glosses": [
        "Alternative form of gold master"
      ],
      "id": "en-golden_master-en-noun-BB44p9PS",
      "links": [
        [
          "gold master",
          "gold master#English"
        ]
      ],
      "tags": [
        "alt-of",
        "alternative"
      ]
    }
  ],
  "word": "golden master"
}

{
  "forms": [
    {
      "form": "golden masters",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "golden master (plural golden masters)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "gold master"
        }
      ],
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with quotations",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "examples": [
        {
          "ref": "2009, Gary L. Reback, Free the Market!, Penguin, →ISBN:",
          "text": "Microsoft had just released its “golden master,” the production disk that computer manufacturers used to install Windows 95 on every personal computer they sold.",
          "type": "quote"
        }
      ],
      "glosses": [
        "Alternative form of gold master"
      ],
      "links": [
        [
          "gold master",
          "gold master#English"
        ]
      ],
      "tags": [
        "alt-of",
        "alternative"
      ]
    }
  ],
  "word": "golden master"
}