diff --git a/Makefile b/Makefile
index 9e2ba52..975e7e5 100644
--- a/Makefile
+++ b/Makefile
@@ -9,14 +9,19 @@ LDFLAGS = $(UPDFPARSERLIB)
 
 BUILD_STATIC ?= 0
 BUILD_SHARED ?= 1
+BUILD_UTILS  ?= 1
 
 TARGETS =
-ifneq (BUILD_STATIC, 0)
+ifneq ($(BUILD_STATIC), 0)
   TARGETS += libgourou.a
 endif
-ifneq (BUILD_SHARED, 0)
+ifneq ($(BUILD_SHARED), 0)
   TARGETS += libgourou.so
 endif
+ifneq ($(BUILD_UTILS), 0)
+  TARGETS += build_utils
+endif
+
 
 ifneq ($(DEBUG),)
 CXXFLAGS += -ggdb -O0
@@ -34,9 +39,7 @@ OBJEXT      := o
 SOURCES      = src/libgourou.cpp src/user.cpp src/device.cpp src/fulfillment_item.cpp src/bytearray.cpp src/pugixml.cpp
 OBJECTS     := $(patsubst $(SRCDIR)/%,$(BUILDDIR)/%,$(SOURCES:.$(SRCEXT)=.$(OBJEXT)))
 
-.PHONY: utils
-
-all: lib obj $(TARGETS) utils
+all: lib obj $(TARGETS)
 
 lib:
 	mkdir lib
@@ -56,7 +59,7 @@ libgourou.a: $(OBJECTS)
 libgourou.so: $(OBJECTS) $(UPDFPARSERLIB)
 	$(CXX) obj/*.o $(LDFLAGS) -o $@ -shared
 
-utils:
+build_utils:
 	make -C utils ROOT=$(PWD) CXX=$(CXX) AR=$(AR) DEBUG=$(DEBUG) STATIC_UTILS=$(STATIC_UTILS)
 
 clean:
diff --git a/README.md b/README.md
index ff7b51a..f98cb44 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,7 @@
 Introduction
 ------------
 
-libgourou is a free implementation of Adobe's ADEPT protocol used to add DRM on ePub files. It overcome the lacks of Adobe support for Linux platforms.
+libgourou is a free implementation of Adobe's ADEPT protocol used to add DRM on ePub/PDF files. It overcome the lacks of Adobe support for Linux platforms.
 
 
 Architecture
@@ -19,13 +19,15 @@ Main fucntions to use from gourou::DRMProcessor are :
 
 You can import configuration from (at least) :
 
-  * Kobo device : .adept/device.xml, .adept/devicesalt  and .adept/activation.xml
+  * Kobo device    : .adept/device.xml, .adept/devicesalt  and .adept/activation.xml
   * Bookeen device : .adobe-digital-editions/device.xml, root/devkey.bin and .adobe-digital-editions/activation.xml
   
 Or create a new one. Be careful : there is a limited number of devices that can be created bye one account.
 
 ePub are encrypted using a shared key : one account / multiple devices, so you can create and register a device into your computer and read downloaded (and encrypted) ePub file with your eReader configured using the same AdobeID account.
 
+For those who wants to remove DRM, you can export your private key and import it within [Calibre](https://calibre-ebook.com/) an its DeDRM plugin.
+
 
 Dependencies
 ------------
@@ -47,18 +49,21 @@ Compilation
 
 Use _make_ command
 
-    make [CROSS=XXX] [DEBUG=1] [STATIC_UTILS=1] [BUILD_STATIC=(0|1)] [BUILD_SHARED=(0|1)]
+    make [CROSS=XXX] [DEBUG=1] [STATIC_UTILS=1] [BUILD_UTILS=(0|1)] [BUILD_STATIC=(0|1)] [BUILD_SHARED=(0|1)]
 
 CROSS can define a cross compiler prefix (ie arm-linux-gnueabihf-)
 
 DEBUG can be set to compile in DEBUG mode
 
+BUILD_UTILS to build utils or not (activated by default)
+
 STATIC_UTILS to build utils with static library (libgourou.a) instead of default dynamic one (libgourou.so)
 
 BUILD_STATIC build libgourou.a if 1, nothing if 0 (default value), can be combined with BUILD_SHARED
 
 BUILD_SHARED build libgourou.so if 1 (default value), nothing if 0, can be combined with BUILD_STATIC
 
+
 Utils
 -----
 
@@ -69,11 +74,16 @@ You can import configuration from your eReader or create a new one with utils/ac
 
 Then a _./.adept_ directory is created with all configuration file
 
-To download an ePub :
+To download an ePub/PDF :
 
     export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$PWD
     ./utils/acsmdownloader -f <ACSM_FILE>
 
+To export your private key :
+
+    export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$PWD
+    ./utils/acsmdownloader --export-private-key [-o adobekey_1.der]
+
 
 Copyright
 ---------