密码保护PDF文件 [英] Password protecting a PDF file

问题描述

我有以下内容:

• 例行X，它每天创建一个PDF文件.
• 将这个文件附加到Outlook电子邮件并将其发送给收件人的例程Y.

以上两者均在VBA中.它们是从C#控制台应用程序调用的.

Both the above are in VBA. They are called from a C# console application.

创建PDF后，我需要用密码保护它.在不购买第三方软件的情况下通过VBA进行此操作相当麻烦.

Once the PDF has been created I need to password protect it. To do this via VBA without purchasing third party software is quite involved.

使用C#最简单的解决方案是什么?

What is the simplest solution using C#?

(我怀疑我们花费的金额和答案的复杂性之间存在反比关系！)

(I'm suspecting there will be an inverse relationship between amount we spend and complexity of answer!)

推荐答案

PDFSharp 应该能够使用密码保护PDF文件:

PDFSharp should be able to protect a PDF file with a password:

// Open an existing document. Providing an unrequired password is ignored.
PdfDocument document = PdfReader.Open(filename, "some text");

PdfSecuritySettings securitySettings = document.SecuritySettings;

// Setting one of the passwords automatically sets the security level to 
// PdfDocumentSecurityLevel.Encrypted128Bit.
securitySettings.UserPassword  = "user";
securitySettings.OwnerPassword = "owner";

// Don't use 40 bit encryption unless needed for compatibility reasons
//securitySettings.DocumentSecurityLevel = PdfDocumentSecurityLevel.Encrypted40Bit;

// Restrict some rights.
securitySettings.PermitAccessibilityExtractContent = false;
securitySettings.PermitAnnotations = false;
securitySettings.PermitAssembleDocument = false;
securitySettings.PermitExtractContent = false;
securitySettings.PermitFormsFill = true;
securitySettings.PermitFullQualityPrint = false;
securitySettings.PermitModifyDocument = true;
securitySettings.PermitPrint = false;

// Save the document...
document.Save(filename);

参考:
http://www.pdfsharp.net/wiki/ProtectDocument-sample.ashx

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