PDF文件是一种广泛使用的文档格式，它能够保护内容的完整性和防止未经授权的访问。然而，有时候我们需要去除PDF的密码或数字证书以进行编辑或其他合法用途。本文将深入探讨如何去除PDF的密码和数字证书，以及使用特定软件来解决这个问题。 我们需要理解PDF加密的两种类型：打开密码和权限密码。打开密码是为了防止未经授权的人打开PDF，而权限密码则限制了打印、复制、编辑等操作。去除这两种密码的方法有所不同。 去除PDF打开密码相对简单，如果知道正确的密码，大部分PDF阅读器都允许用户输入密码后解除锁定。但如果忘记密码，就需要借助专门的工具。描述中提到的"VeryPDF PDF Password Remover"就是这样一款工具，它可以移除PDF的打开密码，让你无限制地访问内容。 去除PDF的权限密码则更为复杂，因为这涉及到对文件权限的修改。VeryPDF PDF Password Remover也能处理这种情况，通过移除数字证书和权限设置，用户可以进行必要的编辑操作。这款软件的工作原理是读取PDF的元数据，然后创建一个新的、无密码的PDF副本。 使用VeryPDF PDF Password Remover的步骤大致如下： 1. 下载并安装软件。从提供的链接"软件爱好者www.isofter.cn - 最新最全 软件资讯 共享平台.url"中，你可以找到该软件的最新版本。 2. 打开软件，然后导入你需要去除密码的PDF文件。 3. 如果你知道打开密码，输入后点击“解锁”或相应按钮。对于权限密码，软件通常会自动处理。 4. 设置输出选项，如保存路径和文件名。 5. 点击“开始”或“转换”按钮，软件将创建一个新的、没有密码的PDF文件。 需要注意的是，去除PDF密码和数字证书可能涉及版权和隐私问题。只有在确保你有合法权利访问并处理这些文件时，才应进行此类操作。此外，去除密码可能导致PDF的安全性降低，因为它不再受到原始保护措施的约束。 去除PDF密码和数字证书是解决访问受限问题的一种方法。使用像VeryPDF PDF Password Remover这样的专业工具，可以有效地处理这类问题，但同时也需意识到这样做可能带来的法律和安全风险。在处理受保护的PDF文件时，应始终遵守相关法律法规，尊重知识产权。

PDF.winDecrypt，可进行PDF文档设置密码时，不小心把密码遗忘了时候清除密码，查看文档内容

删除别人设置的 PDF的编辑、打印权限密码 删除 PDF 密码后，您可以从解密的 PDF 中复制内容文本，并在任何需要的地方使用文本。 无法转换受限制的 PDF 文档。经过 PDF Password Remover 处理后，PDF 文件可以通过其他 PDF 转换器转换并导出为 MS Word、Excel、图像和其他可编辑格式。 在从受保护的 PDF 中删除密码之前，用户无权打印 PDF。一旦删除了密码和限制，PDF 文件就可以像普通文档一样很好地打印。 把PFD文件 拖入软件即可删除作者设置的编辑、打印密码（左下角 输出路径 可自己设置） 包含注册码

VeryPDF Password Remover是一个移除PDF文档密码和限制工具，该软件并不是花时间去破解pdf文件密码及功能限制密码，而是直接移除。

PDF密码破解软件绿色 v3.1(含注册机)

可以即时解锁PDF文件并可以去掉编辑，打印和复制的限制。快速有效地打开加密和有密码保护的PDF文件。这项正在申请Thunder Tables?专利的技术能保证在一分钟之内恢复40位的密码。现代多核电脑提供了多线程低层次代码优化，从而在最好的性能下最快地恢复最复杂的密码。 以下是官网介绍： Recover PDF Passwords and Instantly Remove PDF Restrictions Get access to password-protected PDF files quickly and efficiently! Instantly unlock restricted PDF documents by removing printing, editing and copying restrictions! Advanced PDF Password Recovery recovers or instantly removes passwords protecting or locking PDF documents created with all versions of Adobe Acrobat or any other PDF application. Features and Benefits Supports all versions of Adobe Acrobat, including Acrobat 9 Supports GPU acceleration Supports all third-party products producing PDF files Instantly unlocks PDF documents with printing, copying and editing restrictions Removes “owner” and “user” passwords Recovers passwords to open Supports 40-bit and 128-bit RC4 encryption as well as 128-bit and 256-bit AES encryption Patent-pending Thunder Tables? technology recovers 40-bit passwords in a matter of minutes Dictionary and brute-force attacks with user-defined masks and advanced templates Three editions to satisfy the most demanding and savvy customers Optionally removes JScript code, form fields and digital signatures Batch mode allows automatic processing of multiple files Highly optimized low-level code optimized for modern multi-core CPUs Instant Access to Restricted PDF Documents Remove annoying restrictions from PDF files! Advanced PDF Password Recovery instantly unlocks PDF documents that restrict you of printing, editing or copying of data to clipboard. This is by far the most common protection found in PDF files. If you can open a document without a password, but cannot print it at all or are restricted to low-quality output, or if you cannot copy data to clipboard or cannot edit the document, read no further and get Advanced PDF Password Recovery Standard edition! Passwords to Open What if you can’t open a PDF document at all without knowing the correct password? In that case, you’ll need the password recovery feature found in the Professional and Enterprise editions of Advanced PDF Password Recovery. The PDF format specifies two types of protection: the weak 40-bit and the strong 128-bit encryption. Advanced PDF Password Recovery guarantees the recovery of 40-bit keys by attacking the encryption key instead of attempting to guess the password. While the Professional edition takes up to several days to recover a PDF document protected with a 40-bit key, the Enterprise edition can unlock an encrypted PDF in a matter of minutes! Thunder Tables? Technology (Patent Pending) The unique Thunder Tables? technology developed by ElcomSoft uses pre-computed tables to significantly speed up the recovery of 40-bit keys. The technology is available in the Enterprise edition, and will unlock a protected document in a matter of minutes instead of days. Strong Password Recovery If the PDF is protected with a strong 128-bit or 256-bit key, Advanced PDF Password Recovery performs a range of attacks on the PDF file document in order to obtain the original password. But even then you’re not left without options! Dictionary Attack Most passwords used by living beings are based on a word or phrase. Performing a dictionary attack by attempting different combinations of cases and variations of words and characters before reverting to a comprehensive brute-force attack allows for considerate time savings shall the attack succeed. Brute Force Attack If the password does not fall into any dictionary, Advanced PDF Password Recovery attempts all possible combinations of passwords by performing the brute force attack. The highly optimized low-level code provides the best-in-class performance for the brute-force password recovery. Multi-threaded optimization ensures optimum performance on the modern multi-core CPUs. Additional Notes Mac Computers: Advanced PDF Password Recovery may not run on Mac running Windows 2000/XP/Vista on a virtual machine (using Virtual PC, VMWare, Parallels or other virtualization software). DRM and Third-Party Security Plug-ins: Advanced PDF Password Recovery does not support PDF files protected using Digital Rights Management (DRM) technology or any third-party party security plug-ins such as FileOpen (FOPN_fLock). Version 5.0 works with PDF files created in Adobe Acrobat 9 (with 256-bit AES encryption), with multi-core and multi-processor support and hardware acceleration using NVIDIA cards.

PDF破解密码HAP_APDFPR_5.00.rar，PDF文件密码破解，有需要的可以尝试

试了好几个乱七八糟的压缩包破解软件，还是这个靠谱省心 虽然收费，但是很便宜 而且官网专人售后，30天无效退款

PDF密码破解软件，可以批量破解，破解速度超快，平均一秒钟一个，自己经常用的，免费下载啦。。。

有的pdf有安全设置，不能复制，一般只需消除保护即可，消除pdf密码