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robsean translating
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How To Remove Password From A PDF File in Linux
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======
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Today I happen to share a password protected PDF file to one of my friend. I knew the password of that PDF file, but I didn’t want to disclose it. Instead, I just wanted to remove the password and send the file to him. I started to looking for some easy ways to remove the password protection from the pdf files on Internet. After a quick google search, I came up with four methods to remove password from a PDF file in Linux. The funny thing is I had already done it few years ago and I almost forgot it. If you’re wondering how to remove password from a PDF file in Linux, read on! It is not that difficult.
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### Remove Password From A PDF File in Linux
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**Method 1 – Using Qpdf**
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The **Qpdf** is a PDF transformation software which is used to encrypt and decrypt PDF files, convert PDF files to another equivalent pdf files. Qpdf is available in the default repositories of most Linux distributions, so you can install it using the default package manager.
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For example, Qpdf can be installed on Arch Linux and its variants using [**pacman**][1] as shown below.
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```
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$ sudo pacman -S qpdf
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```
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On Debian, Ubuntu, Linux Mint:
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```
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$ sudo apt-get install qpdf
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```
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Now let us remove the password from a pdf file using qpdf.
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I have a password-protected PDF file named **“secure.pdf”**. Whenever I open this file, it prompts me to enter the password to display its contents.
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![][3]
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I know the password of the above pdf file. However, I don’t want to share the password with anyone. So what I am going to do is to simply remove the password of the PDF file using Qpdf utility with following command.
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```
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$ qpdf --password='123456' --decrypt secure.pdf output.pdf
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```
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Quite easy, isn’t it? Yes, it is! Here, **123456** is the password of the **secure.pdf** file. Replace the password with your own.
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**Method 2 – Using Pdftk**
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**Pdftk** is yet another great software for manipulating pdf documents. Pdftk can do almost all sort of pdf operations, such as;
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* Encrypt and decrypt pdf files.
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* Merge PDF documents.
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* Collate PDF page Scans.
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* Split PDF pages.
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* Rotate PDF files or pages.
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* Fill PDF forms with X/FDF data and/or flatten forms.
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* Generate FDF data stencils from PDF forms.
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* Apply a background watermark or a foreground stamp.
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* Report PDF metrics, bookmarks and metadata.
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* Add/update PDF bookmarks or metadata.
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* Attach files to PDF pages or the PDF document.
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* Unpack PDF attachments.
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* Burst a PDF file into single pages.
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* Compress and decompress page streams.
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* Repair corrupted PDF file.
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Pddftk is available in AUR, so you can install it using any AUR helper programs on Arch Linux its derivatives.
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Using [**Pacaur**][4]:
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```
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$ pacaur -S pdftk
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```
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Using [**Packer**][5]:
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```
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$ packer -S pdftk
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```
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Using [**Trizen**][6]:
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```
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$ trizen -S pdftk
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```
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Using [**Yay**][7]:
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```
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$ yay -S pdftk
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```
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Using [**Yaourt**][8]:
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```
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$ yaourt -S pdftk
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```
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On Debian, Ubuntu, Linux Mint, run:
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```
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$ sudo apt-get instal pdftk
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```
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On CentOS, Fedora, Red Hat:
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First, Install EPEL repository:
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```
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$ sudo yum install epel-release
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```
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Or
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```
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$ sudo dnf install epel-release
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```
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Then install PDFtk application using command:
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```
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$ sudo yum install pdftk
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```
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Or
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```
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$ sudo dnf install pdftk
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```
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Once pdftk installed, you can remove the password from a pdf document using command:
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```
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$ pdftk secure.pdf input_pw 123456 output output.pdf
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```
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Replace ‘123456’ with your correct password. This command decrypts the “secure.pdf” file and create an equivalent non-password protected file named “output.pdf”.
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**Also read:**
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**Method 3 – Using Poppler**
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**Poppler** is a PDF rendering library based on the xpdf-3.0 code base. It contains the following set of command line utilities for manipulating PDF documents.
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* **pdfdetach** – lists or extracts embedded files.
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* **pdffonts** – font analyzer.
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* **pdfimages** – image extractor.
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* **pdfinfo** – document information.
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* **pdfseparate** – page extraction tool.
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* **pdfsig** – verifies digital signatures.
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* **pdftocairo** – PDF to PNG/JPEG/PDF/PS/EPS/SVG converter using Cairo.
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* **pdftohtml** – PDF to HTML converter.
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* **pdftoppm** – PDF to PPM/PNG/JPEG image converter.
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* **pdftops** – PDF to PostScript (PS) converter.
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* **pdftotext** – text extraction.
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* **pdfunite** – document merging tool.
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For the purpose of this guide, we only use the “pdftops” utility.
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To install Poppler on Arch Linux based distributions, run:
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```
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$ sudo pacman -S poppler
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```
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On Debian, Ubuntu, Linux Mint:
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```
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$ sudo apt-get install poppler-utils
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```
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On RHEL, CentOS, Fedora:
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```
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$ sudo yum install poppler-utils
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```
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Once Poppler installed, run the following command to decrypt the password protected pdf file and create a new equivalent file named output.pdf.
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```
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$ pdftops -upw 123456 secure.pdf output.pdf
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```
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Again, replace ‘123456’ with your pdf password.
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As you might noticed in all above methods, we just converted the password protected pdf file named “secure.pdf” to another equivalent pdf file named “output.pdf”. Technically speaking, we really didn’t remove the password from the source file, instead we decrypted it and saved it as another equivalent pdf file without password protection.
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**Method 4 – Print to a file
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**
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This is the easiest method in all of the above methods. You can use your existing PDF viewer such as Atril document viewer, Evince etc., and print the password protected pdf file to another file.
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Open the password protected file in your PDF viewer application. Go to **File - > Print**. And save the pdf file in any location of your choice.
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![][9]
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And, that’s all. Hope this was useful. Do you know/use any other methods to remove the password protection from PDF files? Let us know in the comment section below.
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More good stuffs to come. Stay tuned!
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Cheers!
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--------------------------------------------------------------------------------
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via: https://www.ostechnix.com/how-to-remove-password-from-a-pdf-file-in-linux/
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作者：[SK][a]
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选题：[lujun9972](https://github.com/lujun9972)
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译者：[译者ID](https://github.com/译者ID)
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校对：[校对者ID](https://github.com/校对者ID)
|
||||
|
||||
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
|
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[a]:https://www.ostechnix.com/author/sk/
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[1]:https://www.ostechnix.com/getting-started-pacman/
|
||||
[2]:data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7
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||||
[3]:http://www.ostechnix.com/wp-content/uploads/2018/04/Remove-Password-From-A-PDF-File-1.png
|
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[4]:https://www.ostechnix.com/install-pacaur-arch-linux/
|
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[5]:https://www.ostechnix.com/install-packer-arch-linux-2/
|
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[6]:https://www.ostechnix.com/trizen-lightweight-aur-package-manager-arch-based-systems/
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[7]:https://www.ostechnix.com/yay-found-yet-another-reliable-aur-helper/
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[8]:https://www.ostechnix.com/install-yaourt-arch-linux/
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@ -0,0 +1,222 @@
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robsean Translating
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如何在Linux中从一个PDF文件中移除密码
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======
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今天，我碰巧分享一个受密码保护的 PDF 文件给我的一个朋友。我知道这个PDF文件的密码，但是我不想透露密码。作为代替，我只想移除密码并发送文件给他。我开始在因特网上查找一些简单的方法来从 pdf 文件中移除密码保护。在快速 google 搜索后，在 Linux 中，我带来四种方法来从一个 PDF 文件中移除密码 。有趣的事是，在几年以前我已经做到它，并且我也忘记它了。如果你疑惑，如何在 Linux 中从一个 PDF 文件移除密码，继续读!它是不难的。
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### 在Linux中从一个PDF文件中移除密码
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**方法 1 – 使用 Qpdf**
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**Qpdf** 是一个 PDF 转换软件，它被用于加密和解密 PDF 文件，转换 PDF 文件到其他等效的 pdf 文件。 Qpdf 在大多数 Linux 发行版中的默认存储库中是可用的，所以你可以使用默认的软件包安装它。
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例如， Qpdf 可以被安装在 Arch Linux 和它的衍生版，使用 [**pacman**][1] ，像下面显示。
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```
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$ sudo pacman -S qpdf
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```
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在 Debian, Ubuntu, Linux Mint 上：
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```
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$ sudo apt-get install qpdf
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```
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现在，让我们使用 qpdf 从一个 pdf 文件移除密码。
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我有一个受密码保护的 PDF 文件，名为 **“secure.pdf”**. 每当我打开这个文件时，它提示我输入密码来显示它的内容。
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![][3]
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我知道上面 pdf 文件的密码。然而，我不想与任何人共享密码。所以，我将要做的事是简单地移除 PDF 文件的密码，使用 Qpdf 功能带有下面的命令。
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```
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$ qpdf --password='123456' --decrypt secure.pdf output.pdf
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```
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相当简单，不是吗？是的，它是！这里, **123456** 是 **secure.pdf** 文件的密码。用你自己的密码替换。
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**方法 2 – 使用 Pdftk**
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**Pdftk** 是另一个用于操作 pdf 文件的好软件。 Pdftk 可以做几乎所有分类的 pdf 操作，例如;
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* 加密和解密 pdf 文件。
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* 合并 PDF 文档。
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* 整理 PDF 页扫描。
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* 拆分 PDF 页。
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* 旋转 PDF 文件或页。
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* 用 X/FDF 数据 填充 PDF 表单，和/或摧毁表单。
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* 从 PDF 表单中生成 PDF数据模板。
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* 应用一个背景水印，或一个前景印记。
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* 报告 PDF 度量标准，书签和元数据。
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* 添加/更新 PDF 书签或元数据。
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* 附加文件到 PDF 页，或 PDF 文档。
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* 解包 PDF 附件。
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* 破裂一个 PDF 文件到单页中。
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* 压缩和解压缩页流。
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* 修复破损的 PDF 文件。
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Pddftk 在 AUR 中是可用的，所以你可以在 Arch Linux 和它的衍生版上使用任意 AUR 帮助程序安装它。
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使用 [**Pacaur**][4]:
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```
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$ pacaur -S pdftk
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```
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使用 [**Packer**][5]:
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```
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$ packer -S pdftk
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```
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使用 [**Trizen**][6]:
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```
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$ trizen -S pdftk
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```
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使用 [**Yay**][7]:
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```
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$ yay -S pdftk
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```
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使用 [**Yaourt**][8]:
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```
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$ yaourt -S pdftk
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```
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在 Debian, Ubuntu, Linux Mint 上，运行：
|
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```
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$ sudo apt-get instal pdftk
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```
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|
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在 CentOS, Fedora, Red Hat 上：
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|
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首先，安装 EPEL 仓库：
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```
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$ sudo yum install epel-release
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|
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```
|
||||
|
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或
|
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```
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$ sudo dnf install epel-release
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```
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然后，安装 PDFtk 应用程序，使用命令：
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```
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$ sudo yum install pdftk
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```
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或者
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```
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$ sudo dnf install pdftk
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```
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一旦 pdftk 安装，你可以从一个 pdf 文档移除密码，使用命令：
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```
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$ pdftk secure.pdf input_pw 123456 output output.pdf
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```
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用你正确的密码替换“123456”。这个命令解密 “secure.pdf” 文件，并创建一个相同的名为 “output.pdf” 的非密码保护的文件。
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**也读：**
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**方法 3 – 使用 Poppler**
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**Poppler** 是一个基于 xpdf-3.0 代码基础的 PDF 渲染库。它包含下列用于操作 PDF 文档的命令行功能集。
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* **pdfdetach** – 列出或提取嵌入的文件。
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* **pdffonts** – 字体分析器。
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* **pdfimages** – 图片提取器。
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* **pdfinfo** – 文档信息。
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* **pdfseparate** – 页提取工具。
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* **pdfsig** – 核查数字签名。
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* **pdftocairo** – PDF 到 PNG/JPEG/PDF/PS/EPS/SVG 转换器，使用 Cairo 。
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* **pdftohtml** – PDF 到 HTML 转换器。
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* **pdftoppm** – PDF 到 PPM/PNG/JPEG 图片转换器。
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* **pdftops** – PDF 到 PostScript (PS) 转换器。
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* **pdftotext** – text 提取。
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* **pdfunite** – 文档合并工具。
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因这个指南的目的，我们仅使用 “pdftops” 功能。
|
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在基于 Arch Linux 的发行版上，安装 Poppler，运行：
|
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```
|
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$ sudo pacman -S poppler
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|
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```
|
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|
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在 Debian, Ubuntu, Linux Mint 上：
|
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```
|
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$ sudo apt-get install poppler-utils
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|
||||
```
|
||||
|
||||
在 RHEL, CentOS, Fedora 上：
|
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```
|
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$ sudo yum install poppler-utils
|
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|
||||
```
|
||||
|
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一旦 Poppler 安装，运行下列命令来解密密码保护的 pdf 文件，并创建一个新的相同的名为 output.pdf 的文件。
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```
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$ pdftops -upw 123456 secure.pdf output.pdf
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```
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再一次，用你的 pdf 密码替换 “123456” 。
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正如你在上面方法中可能注意到，我们仅转换密码保护的名为 “secure.pdf” 的 pdf 文件到另一个相同的名为 “output.pdf” 的 pdf 文件。技术上讲，我们并没有真的重源文件中移除密码，作为代替，我们解密它，并保存它为另一个相同的没有密码保护的 pdf 文件。
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**方法 4 – 打印到一个文件
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**
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这是在所有上面方法中的最简单的方法。你可以使用你存在的 PDF 查看器，例如 Atril 文档查看器, Evince 等等，并打印密码保护的 pdf 文件到另一个文件。
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在你的 PDF 查看器应用程序中打开密码保护的文件。转到 **File - > Print** 。并在你选择的一些位置保存 pdf 文件。
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![][9]
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于是，这是全部。希望这是有用的。你知道/使用一些其它方法来从从 PDF 文件中移除密码保护And吗？在下面的评价区让我们知道。
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更多好东西来了。敬请期待！
|
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|
||||
谢谢！
|
||||
|
||||
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||||
|
||||
--------------------------------------------------------------------------------
|
||||
|
||||
via: https://www.ostechnix.com/how-to-remove-password-from-a-pdf-file-in-linux/
|
||||
|
||||
作者：[SK][a]
|
||||
选题：[lujun9972](https://github.com/lujun9972)
|
||||
译者：[robsean ](https://github.com/robsean)
|
||||
校对：[校对者ID](https://github.com/校对者ID)
|
||||
|
||||
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
|
||||
|
||||
[a]:https://www.ostechnix.com/author/sk/
|
||||
[1]:https://www.ostechnix.com/getting-started-pacman/
|
||||
[2]:data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7
|
||||
[3]:http://www.ostechnix.com/wp-content/uploads/2018/04/Remove-Password-From-A-PDF-File-1.png
|
||||
[4]:https://www.ostechnix.com/install-pacaur-arch-linux/
|
||||
[5]:https://www.ostechnix.com/install-packer-arch-linux-2/
|
||||
[6]:https://www.ostechnix.com/trizen-lightweight-aur-package-manager-arch-based-systems/
|
||||
[7]:https://www.ostechnix.com/yay-found-yet-another-reliable-aur-helper/
|
||||
[8]:https://www.ostechnix.com/install-yaourt-arch-linux/
|
||||
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