将序列号嵌入到PDF文件中? [英] embed serial number to PDF file?

问题描述

为防止随便分发pdf文档，是否可以将序列号嵌入文件中?

To prevent the casual distribution of pdf document, is there any way such as embedding the serial number to the file?

我的想法是嵌入绑定到用户的ID，并启用查找分发文件的人. 我知道这并不能阻止分发，但是可能会在一定程度上阻止临时分发.

My idea is to embed the id bound to user and enable to find who distribute the file. I know it's not preventing the distribution but may discourage the casual distribution by the certain level.

也欢迎任何其他解决方案.

Any other solution is also welcome.

谢谢！

推荐答案

常见的方式是放置元数据，但是您可以轻松地删除它们. 让我们搜索隐藏物(其中大多数是低级的)！

Common way is placing of meta data, but you can easily remove them. Let's search hideouts (most of them low-level)!

• 非标记文字
• 重叠对象下的文字
• 旧版本的对象(读者不会注意到，但是有多余的信息)
• 在BX-EX之间的流中标记(带有来自读者观点的奇怪信息)
• ％PDF-X之前的信息
• 高于%% EOF的信息
• 替换某些元素的名称(例如字体名称)
• 隐写术
• • 通过使用的字体进行操作
  • Non-mark text
  • Text under overlapping objects
  • Objects of older versions (doesn't noticed by reader, but there with redundant information)
  • Marks in streams between BX-EX (with weird information from readers point of view)
  • Information before %PDF-X
  • Information above %%EOF
  • Substitution of names for some elements (like font name)
  • Steganography
  • • Manipulation from used fonts
    • 白色间距
    • 带有setganograpy的图像

    我最喜欢的是流中的隐写术和BX-EX块，通过适当的压缩和/或加密很难找到(如果不知道，它在哪里).为了使搜索更加困难，请使用BX-EX包裹一些常规块.

    My favorite are steganography and BX-EX block within stream, with proper compression and/or encryption it is hard to find (if do not know, where it is). To make search harder wrap some normal blocks with BX-EX.

    有些方法很容易删除，有些很难，但是坚决的攻击者将能够找到所有方法并进行消毒.考虑文本的复制粘贴或通过PDF打印机的打印槽.

    Some of ways are easy to remove, some harder, but decided attacker will be able to find and sanitize them all. Think about copy-paste of text or print trough PDF-printer.

    这篇关于将序列号嵌入到PDF文件中?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！