c# - 使用 C# 加密 PDF 文档

Question

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Answer 1

Atalasoft PDF library (dotImage 的一部分)可以为您处理 PDF 文档的加密或解密(免责声明，我在 Atalasoft 工作并编写了库)。代码非常简单:

public void EncryptPdf(Stream input, Stream output, string userPassword, string ownerPassword)
{
    if (input == output) throw new ArgumentExeption("input", "input and output must be different");
    PdfDocument doc = new PdfDocument(input);
    // at this point if you set doc.Permissions, you can fine-control what can be
    // done to the document.  If userPassword is null, then the document can be opened
    // without a password prompt, but will be restricted to the permissions.
    // Permissions includes things like Printing, Modifying, Copying Text etc.
    doc.Save(userPassword, ownerPassword, output);
}