"ring-fenced" meaning in English

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          "ref": "2020 December 2, Andy Byford talks to Paul Clifton, “I enjoy really big challenges...”, in Rail, page 50:",
          "text": "To have ring-fenced funding that can't be taken away when there's a change of political wind is immensely beneficial.",
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        "simple past and past participle of ring-fence"
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