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為開發者提供強大的PDF安全選項，支援PDF元資料、自訂和設置密碼、權限等。利用IronPDF的密碼、安全性和元資料選項，您可以建立自訂權限和安全級別，以滿足您的PDF文件需求。這是透過使用MetaData類別來實現的。一些選項包括限制PDF文件為不可列印、設置為唯讀，以及128位元加密和密碼保護您的PDF文件。

透過實作MetaData類別來存取各PDF元資料選項，並用您的自訂值設置即可實現自訂元資料的設定。這包括更改作者、關鍵字、修改日期等。自訂安全設定包含設置自訂使用者和擁有者密碼、列印權限、唯讀模式等功能。

設置PDF密碼、元資料和安全的5個步驟

var pdf = PdfDocument.FromFile("encrypted.pdf", "password");
System.Collections.Generic.List<string> metadatakeys = pdf.MetaData.Keys;
var metadatakeys = pdf.MetaData.Keys;
pdf.MetaData.Author = "Satoshi Nakamoto";
pdf.SecuritySettings.MakePdfDocumentReadOnly("secret-key");

為了開始自訂PDF文件的安全性，您首先必須載入一個現有的PDF或建立一個新的。在這裡，我們已經載入了一個具有密碼保護的PDF文件，並輸入了開啟PDF文件所需的密碼。一旦PDF載入後，我們使用pdf.MetaData.Keys來獲取PDF的當前元資料。要移除現有的PDF元資料值，使用RemoveMetaDataKey方法。要開始設定新的元資料值，使用pdf.MetaData.Keywords），然後僅需要分配新值給它。如ModifiedData字段則需要日期時間資料。

接下來，我們用SecuritySettings類別設置新的安全設定。如您所見，這裡有各種可以設置的設定。這讓您對每個您處理的PDF文件的權限和安全級別擁有完全控制權。要存取這些設定，只需確保使用MakePdfDocumentReadOnly方法將PDF文件設置為唯讀，並使用128位元加密內容。其他SecuritySettings的選項包括：