license change from GPL to LGPL

README.md

@@ -26,10 +26,21 @@ will be able to lossless wrap any image into a PDF container while performing
 better (in terms of quality/filesize ratio) than existing tools in case the
 input image is a JPEG or JPEG2000 file.
 
-For the record, the imagemagick command to lossless convert any image to
-PDF using zip-encoding, is:
+For example, imagemagick will re-encode the input JPEG image and thus change
+its content:
 
-	convert input.jpg -compress Zip output.pdf
+	$ convert img.jpg img.pdf
+	$ pdfimages img.pdf img.extr # not using -j to be extra sure there is no recompression
+	$ compare -metric AE img.jpg img.extr-000.ppm null:
+	1.6301e+06
+
+If one wants to do a lossless conversion from any format to PDF with
+imagemagick then one has to use zip-encoding:
+
+	$ convert input.jpg -compress Zip output.pdf
+	$ pdfimages img.pdf img.extr # not using -j to be extra sure there is no recompression
+	$ compare -metric AE img.jpg img.extr-000.ppm null:
+	0
 
 The downside is, that using imagemagick like this will make the resulting PDF
 files a few times bigger than the input JPEG or JPEG2000 file and can also not

setup.py

@@ -6,7 +6,7 @@ setup (
     author = "Johannes 'josch' Schauer",
     description = "Convert images to PDF via direct JPEG inclusion.",
     long_description = open('README.md').read(),
-    license = "GPL",
+    license = "LGPL",
     keywords = "jpeg pdf converter",
     classifiers = [
         'Development Status :: 4 - Beta',
@@ -16,7 +16,7 @@ setup (
         'Programming Language :: Python :: 2.6',
         'Programming Language :: Python :: 2.7',
         'Programming Language :: Python :: Implementation :: CPython',
-        'License :: OSI Approved :: GNU General Public License v3 (GPLv3)',
+        'License :: OSI Approved :: GNU Lesser General Public License v3 (LGPLv3)',
         'Programming Language :: Python',
         'Natural Language :: English',
         'Operating System :: OS Independent'],

src/img2pdf.py

@@ -1,17 +1,19 @@
-# Copyright (C) 2012-2013 Johannes 'josch' Schauer <j.schauer at email.de>
+# Copyright (C) 2012-2014 Johannes 'josch' Schauer <j.schauer at email.de>
 #
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
+# This program is free software: you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation, either
+# version 3 of the License, or (at your option) any later
+# version.
 #
 # This program is distributed in the hope that it will be useful,
 # but WITHOUT ANY WARRANTY; without even the implied warranty of
 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 # GNU General Public License for more details.
 #
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+# You should have received a copy of the GNU General Public
+# License along with this program.  If not, see
+# <http://www.gnu.org/licenses/>.
 
 import sys
 import zlib