clarified the license implication of pickled models/processors

LICENSE

@@ -39,7 +39,8 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 Data/model files:
 -----------------
 
-Data and model files usually have .npy, .npz, .h5, .hdf5, .mat file extensions.
+Data and model files usually have .npy, .npz, .h5, .hdf5, .pkl or .mat file
+extensions.
 
 All model and data files are distributed under the following license:
 
@@ -66,4 +67,5 @@ http://creativecommons.org/licenses/by-nc-sa/4.0/legalcode
 
 If you want to include any of these files (or a variation or modification
 thereof) or technology which utilises them in a commercial product, please
-contact Gerhard Widmer at [email protected].
+contact Gerhard Widmer at [email protected]. Please note that pickled
+Processors (i.e. saved models) fall into this category.

madmom/__init__.py

@@ -62,6 +62,9 @@ def dump(self, outfile):
 
         """
         import cPickle
+        import warnings
+        warnings.warn('The resulting file is considered a model file, please '
+                      'see the LICENSE file for details!')
         # close the open file if needed and use its name
         if not isinstance(outfile, basestring):
             outfile.close()

madmom/utils/__init__.py

@@ -245,7 +245,10 @@ def io_arguments(parser):
     parser.add_argument('-v', dest='verbose', action='count',
                         help='increase verbosity level')
     parser.add_argument('--pickle', type=str, action='store',
-                        help='pickle the processor to the given file')
+                        help='pickle the processor to the given file (please '
+                             'note that the resulting file is considered a '
+                             'model with all the license restrictions, see '
+                             'the LICENSE file for details.')
 
 
 class OverrideDefaultListAction(argparse.Action):