From b78630383f8182e45a663250c5ac9520b825e468 Mon Sep 17 00:00:00 2001
From: Iru Cai <mytbk920423@gmail.com>
Date: Sat, 8 Dec 2018 14:00:41 +0800
Subject: document how to decrypt

---
 README.profxjc | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)
 create mode 100644 README.profxjc

diff --git a/README.profxjc b/README.profxjc
new file mode 100644
index 00000000..7ef0b79d
--- /dev/null
+++ b/README.profxjc
@@ -0,0 +1,22 @@
+编译 MuPDF
+-----------
+
+使用源码和 patch
+~~~~~~~~~~~~~~~~~~~~~~
+
+下载 MuPDF 1.14.0 的源码和 profxjc 的 patch, 解包并 patch::
+
+  curl -O https://mupdf.com/downloads/archive/mupdf-1.14.0-source.tar.xz
+  tar xvf mupdf-1.14.0-source.tar.xz
+  cd mupdf-1.14.0-source
+  curl -o profxjc.patch 'https://git.wehack.space/mupdf/patch/?id=918467458d7572e5d54fc93f60d71c8d80f368f6'
+  patch -p1 -i profxjc.patch
+
+最后构建 mutool, 由于源码中带了所有依赖，因此不需要使用系统已安装的库::
+
+  make USE_SYSTEM_LIBS=no build/release/mutool
+
+文档解密方法
+---------------
+
+build/release/mutool merge -o output.pdf encrypted.pdf
-- 
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