{
  "metadata": {
    "title": "A document that asks for a password before it opens"
  },
  "protection": {
    "user_password": "the reader",
    "owner_password": "the owner",
    "permissions": [
      "printing",
      "printing_at_full_resolution",
      "extracting_for_accessibility"
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        "A document that asks for a password"
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        "before it opens"
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      "content": [
        "This file shows nothing until a password is typed in. Type the"
      ],
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      "font_size": 11.0
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    {
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        "wrong one and no page appears at all."
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        "Everything written in it is scrambled, under a key of two"
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      "content": [
        "hundred and fifty-six bits, and the password is what that key"
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        "is worked out from."
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      "content": [
        "Once it is open, it asks the reading software to let it be"
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        "printed and read out loud, but not copied or changed."
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    {
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      "content": [
        "The password this document asks for: the reader"
      ],
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    },
    {
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      "content": [
        "The author's password opens it too, and lifts the request: the owner"
      ],
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    },
    {
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        "The other document of this pair"
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        "A second document was written beside this one. That one opens"
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        "ury": 487.2
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        "on its own, with nothing to type in, and only asks that it not"
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    },
    {
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        "be copied or changed."
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    },
    {
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      "content": [
        "Where the key comes from"
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      "content": [
        "The thirty-two bytes the key is built from are fixed in this"
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        "example, so that it writes the same file on every run and one"
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      "content": [
        "build can be compared with the last. A program takes them from"
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      "content": [
        "its operating system: a seed anybody can read locks nothing."
      ],
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}