iText禁用打印/复制/保存 [英] iText disable printing/Copying/Saving

问题描述

我写了一个servlet来使用iText来提供PDF。有没有办法从浏览器端禁用打印/复制/保存？

I wrote a servlet to serve PDF using iText. Is there any way to disable printing/Copying/Saving from the browser end?

推荐答案

这是一个提供相关魔术API调用的线程。这个想法是你必须加密PDF以保护各种用户操作。

Here's a thread that provides the relevant magic API invocation. The idea is that you have to encrypt the PDF in order to protect various user operations.

PdfReader reader = new PdfReader("my-old-file.pdf");
PdfStamper stamper = new PdfStamper(reader, new FileOutputStream("my-new-file.pdf"));
stamper.setEncryption("my-owner-password".getBytes(), "my-user-password".getBytes(),
    PdfWriter.AllowPrinting | PdfWriter.AllowCopy, PdfWriter.STRENGTH40BITS);
stamper.close();

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