First Kindle 4 PC solution

skindle/README.txt

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+
+/*
+   Copyright 2010 BartSimpson
+   
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+     http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+/*
+ * Dependencies: none
+ * build on cygwin: gcc -o skindle skindle.c md5.c sha1.c b64.c -lCrypt32
+ * Under cygwin, you can just type make to build it.
+ * While the binary builds if you use the -mno-cygwin switch, it fails to
+ * work for some reason.  The code should compile with Visual Studio, just
+ * add all the files to a project and add the Crypt32.lib dependency and
+ * it should build as a Win32 console app.
+ */
+
+/*
+ * MUST be run on the computer on which KindleForPC is installed
+ * under the account that was used to purchase DRM'ed content.
+ * Requires your kindle.info file which can be found in something like:
+ * <User home>\...\Amazon\Kindle For PC\{AMAwzsaPaaZAzmZzZQzgZCAkZ3AjA_AY}
+ * where ... varies by platform but is "Local Settings\Application Data" on XP
+ */
+
+/*
+  What: KindleForPC DRM removal utility to preserve your fair use rights!
+  Why: Fair use is a well established doctrine, and I am no fan of vendor
+       lockin.
+  How: This utility implements the PID extraction, DRM key generation and
+       decryption algorithms employed by the KindleForPC application. This
+       is a stand alone app that does not require you to determine a PID on
+       your own, and it does not need to run KindleForPC in order to extract
+       any data from memory.
+  
+  Shoutz: The DarkReverser - thanks for mobidedrm!  The last part of this
+       is just a C port of mobidedrm.
+       labba and I<3cabbages for motivating me to do this the right way.
+       You guys shouldn't need to spend all your time responding to all the
+       changes Amazon is going to force you to make in unswindle each time
+       the release a new version.
+       Lawrence Lessig - You are my hero. 'Nuff said.
+   Thumbs down: Disney, MPAA, RIAA - you guys suck.  Making billions off 
+       of the exploitation of works out of copyright while vigourously
+       pushing copyright extension to prevent others from doing the same
+       is the height of hypocrasy.
+       Congress - you guys suck too.  Why you arrogant pricks think you
+       are smarter than the founding fathers is beyond me.
+ */
+
+Rationale:
+Need a tool to enable fair use of purchased ebook content.
+Need a tool that is not dependent on any particular version of
+KindleForPC and that does not need to run KindleForPC in order to
+extract a PID. The tool documents the structure of the kindle.info
+file and the data and algorthims that are used to derive per book
+PID values.
+
+Installing:
+A cygwin compatable binary is included.  You need a minimal cygwin
+installation in order to run it.  To build from source, you will need
+cygwin with gcc and make.  This has not been tested with Visual Studio.
+
+Usage:
+./skindle <drm'ed prc file> <name of output file> <kindle.info path>
+You need to locate your kindle.info file somewhere on your system.
+You can copy it to a local directory, but you need to refer to it
+each time you run skindle.