密碼、安全性與元資料

VB C#

using IronPdf;

// Open an Encrypted File, alternatively create a new PDF from Html
var pdf = PdfDocument.FromFile("encrypted.pdf", "password");

// Get file metadata
System.Collections.Generic.List<string> metadatakeys = pdf.MetaData.Keys(); // returns {"Title", "Creator", ...}

// Remove file metadata
pdf.MetaData.RemoveMetaDataKey("Title");
metadatakeys = pdf.MetaData.Keys(); // return {"Creator", ...} // title was deleted

// Edit file metadata
pdf.MetaData.Author = "Satoshi Nakamoto";
pdf.MetaData.Keywords = "SEO, Friendly";
pdf.MetaData.ModifiedDate = System.DateTime.Now;

// The following code makes a PDF read only and will disallow copy & paste and printing
pdf.SecuritySettings.RemovePasswordsAndEncryption();
pdf.SecuritySettings.MakePdfDocumentReadOnly("secret-key");
pdf.SecuritySettings.AllowUserAnnotations = false;
pdf.SecuritySettings.AllowUserCopyPasteContent = false;
pdf.SecuritySettings.AllowUserFormData = false;
pdf.SecuritySettings.AllowUserPrinting = IronPdf.Security.PdfPrintSecurity.FullPrintRights;

// Change or set the document encryption password
pdf.SecuritySettings.OwnerPassword = "top-secret"; // password to edit the pdf
pdf.SecuritySettings.UserPassword = "sharable"; // password to open the pdf
pdf.SaveAs("secured.pdf");

Imports System
Imports IronPdf

' Open an Encrypted File, alternatively create a new PDF from Html
Private pdf = PdfDocument.FromFile("encrypted.pdf", "password")

' Get file metadata
Private metadatakeys As System.Collections.Generic.List(Of String) = pdf.MetaData.Keys() ' returns {"Title", "Creator", ...}

' Remove file metadata
pdf.MetaData.RemoveMetaDataKey("Title")
metadatakeys = pdf.MetaData.Keys() ' return {"Creator", ...} // title was deleted

' Edit file metadata
pdf.MetaData.Author = "Satoshi Nakamoto"
pdf.MetaData.Keywords = "SEO, Friendly"
pdf.MetaData.ModifiedDate = DateTime.Now

' The following code makes a PDF read only and will disallow copy & paste and printing
pdf.SecuritySettings.RemovePasswordsAndEncryption()
pdf.SecuritySettings.MakePdfDocumentReadOnly("secret-key")
pdf.SecuritySettings.AllowUserAnnotations = False
pdf.SecuritySettings.AllowUserCopyPasteContent = False
pdf.SecuritySettings.AllowUserFormData = False
pdf.SecuritySettings.AllowUserPrinting = IronPdf.Security.PdfPrintSecurity.FullPrintRights

' Change or set the document encryption password
pdf.SecuritySettings.OwnerPassword = "top-secret" ' password to edit the pdf
pdf.SecuritySettings.UserPassword = "sharable" ' password to open the pdf
pdf.SaveAs("secured.pdf")

Install-Package IronPdf

密碼、安全性與元資料

IronPDF 為開發人員提供強大的 PDF 安全性選項，支援自訂與設定 PDF 元資料、密碼、權限等。透過 IronPDF 的密碼、安全性及元資料選項，您可以建立自訂權限與安全性層級，以符合您的 PDF 文件需求。這得益於使用 SecuritySettings 和 MetaData 等類別。可選方案包括將 PDF 文件設為不可列印、設定為唯讀模式、採用 128 位元加密，以及為您的 PDF 文件設定密碼保護。

設定自訂元資料的方式是透過實作 MetaData 類別來存取各種 PDF 元資料選項，並將其設定為您自訂的值。這包括修改作者、關鍵字、修改日期等資訊。自訂安全性設定包含設定自訂使用者與擁有者密碼、列印權限、唯讀模式等功能。

設定 PDF 密碼、元資料與安全性的 5 個步驟

var pdf = PdfDocument.FromFile("encrypted.pdf", "password");
System.Collections.Generic.List metadatakeys = pdf.MetaData.Keys;
var metadatakeys = pdf.MetaData.Keys;
pdf.MetaData.Author = "中本聰";
pdf.SecuritySettings.MakePDFDocumentReadOnly("secret-key");

若要開始自訂 PDF 文件的安全性，您必須先載入現有的 PDF 檔案或建立一個新的 PDF 檔案。在此，我們已載入一份現有的受密碼保護的 PDF 文件，並已輸入開啟該 PDF 文件所需的密碼。載入 PDF 後，我們會使用 pdf.MetaData.Keys 來取得 PDF 的當前元資料。若要移除現有的 PDF 元資料值，請使用 RemoveMetaDataKey 方法。若要開始設定新的元資料值，請使用 pdf.MetaData.metadataField（例如 pdf.MetaData.Keywords），然後將新值賦予該變數即可。元資料欄位如 Title 和 Keywords 接受字串值，而 ModifiedData 欄位則接受日期時間值。

接著，我們已使用 SecuritySettings 類別設定了新的安全性設定。如您所見，此處提供多種可設定的選項。這讓您能完全掌控所處理的每份 PDF 文件的權限與安全性等級。若要存取這些設定，您只需確保使用 MakePdfDocumentReadOnly 方法會將 PDF 文件設為唯讀，並以 128 位元加密內容。 SecuritySettings 的其他選項包括：

AllowUserAnnotations: Controls whether or not users can annotate the PDF.
AllowUserPrinting: Controls printing permissions for the document.
AllowUserFormData: Sets the permissions for whether users can fill in forms.
OwnerPassword: Sets the owner password for the PDF, which is used to disable or enable the other security settings.
UserPassword: Sets the user password for the PDF, which must be entered in order to open or print the document.