[英]How to password protect pdf programmatically in .NET?
I need to programmatically protect a PDF file with a password in C#.我需要在 C# 中使用密码以编程方式保护 PDF 文件。 The same PDF file must be saved with different names and different password.
同一个PDF文件必须用不同的名字和不同的密码保存。
Does anyone know a method for this (no expensive tools, please..)?有谁知道这种方法(请不要使用昂贵的工具..)?
It can be done using itextsharp :可以使用itextsharp来完成:
using (var input = new FileStream("test.pdf", FileMode.Open, FileAccess.Read, FileShare.Read))
using (var output = new FileStream("test_encrypted.pdf", FileMode.Create, FileAccess.Write, FileShare.None))
{
var reader = new PdfReader(input);
PdfEncryptor.Encrypt(reader, output, true, "userPassword", "userPassword", PdfWriter.ALLOW_PRINTING);
}
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