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+Tools for managing widgets
+--------------------------
+
+This project includes tools for managing widgets.
+These tools are:
+
+- ***wgtpkg-info***: command line tool to display
+ informations about a widget file.
+
+- ***wgtpkg-installer***: command line tool to
+ install a widget file.
+
+- ***wgtpkg-pack***: command line tool to create
+ a widget file from a widget directory.
+
+- ***wgtpkg-sign***: command line tool to add a signature
+ to a widget directory.
+
+For all these commands, a tiny help is available with
+options **-h** or **--help**.
+
+There is no tool for unpacking a widget. For doing such operation,
+you can use the command **unzip**.
+
+To list the files of a widget:
+
+```bash
+$ unzip -l WIDGET
+```
+
+To extract a widget in some directory:
+
+```bash
+$ unzip WIDGET -d DIRECTORY
+```
+
+*Note that DIRECTORY will be created if needed*.
+
+Getting data about a widget file
+---------------------------------
+
+The command **wgtpkg-info** opens a widget file, reads its **config.xml**
+file and displays its content in a human readable way.
+
+Signing and packing widget
+--------------------------
+
+### Signing
+
+To sign a widget, you need a private key and its certificate.
+
+The tool **wgtpkg-sign** creates or replace a signature file in
+the directory of the widget BEFORE its packaging.
+
+There are two types of signature files: author and distributor.
+
+Example 1: add an author signature
+
+```bash
+$ wgtpkg-sign -a -k me.key.pem -c me.cert.pem DIRECTORY
+```
+
+Example 2: add a distributor signature
+
+```bash
+$ wgtpkg-sign -k authority.key.pem -c authority.cert.pem DIRECTORY
+```
+
+### Packing
+
+This operation can be done using the command **zip** but
+we provide the tool **wgtpkg-pack** that may add checking.
+
+Example:
+```bash
+$ wgtpkg-pack DIRECTORY -o file.wgt
+```
+Writing a widget
+----------------
+
+### The steps for writing a widget
+
+1. make your application
+
+2. create its configuration file **config.xml**
+
+3. sign it
+
+4. pack it
+
+Fairly easy, no?
+
+Organization of directory of applications
+-----------------------------------------
+
+### directory where are stored applications
+
+Applications can be installed in different places: the system itself, extension device.
+On a phone application are typically installed on the sd card.
+
+This translates to:
+
+ - /usr/applications: system wide applications
+ - /opt/applications: removable applications
+
+From here those paths are referenced as: "APPDIR".
+
+The main path for applications is: APPDIR/PKGID/VER.
+
+Where:
+
+ - APPDIR is as defined above
+ - PKGID is a directory whose name is the package identifier
+ - VER is the version of the package MAJOR.MINOR
+
+This organization has the advantage to allow several versions to leave together.
+This is needed for some good reasons (rolling back) and also for less good reasons (user habits).
+
+### Identity of installed files
+
+All files are installed as user "afm" and group "afm".
+All files have rw(x) for user and r-(x) for group and others.
+
+This allows every user to read every file.
+
+### labeling the directories of applications
+
+The data of a user are in its directory and are labelled by the security-manager
+using the labels of the application.
+
+[widgets]: http://www.w3.org/TR/widgets "Packaged Web Apps"
+[widgets-digsig]: http://www.w3.org/TR/widgets-digsig "XML Digital Signatures for Widgets"
+[libxml2]: http://xmlsoft.org/html/index.html "libxml2"
+[app-manifest]: http://www.w3.org/TR/appmanifest "Web App Manifest"
+
+
+[meta-intel]: https://github.com/01org/meta-intel-iot-security "A collection of layers providing security technologies"
+[widgets]: http://www.w3.org/TR/widgets "Packaged Web Apps"
+[widgets-digsig]: http://www.w3.org/TR/widgets-digsig "XML Digital Signatures for Widgets"
+[libxml2]: http://xmlsoft.org/html/index.html "libxml2"
+[openssl]: https://www.openssl.org "OpenSSL"
+[xmlsec]: https://www.aleksey.com/xmlsec "XMLSec"
+[json-c]: https://github.com/json-c/json-c "JSON-c"
+[d-bus]: http://www.freedesktop.org/wiki/Software/dbus "D-Bus"
+[libzip]: http://www.nih.at/libzip "libzip"
+[cmake]: https://cmake.org "CMake"
+[security-manager]: https://wiki.tizen.org/wiki/Security/Tizen_3.X_Security_Manager "Security-Manager"
+[app-manifest]: http://www.w3.org/TR/appmanifest "Web App Manifest"
+[tizen-security]: https://wiki.tizen.org/wiki/Security "Tizen security home page"
+[tizen-secu-3]: https://wiki.tizen.org/wiki/Security/Tizen_3.X_Overview "Tizen 3 security overview"
+
+
+
+