Whitespace normalization.  Ran reindent.py over the entire source tree.
diff --git a/Demo/pdist/security.py b/Demo/pdist/security.py
index 0ffd511..b63081e 100755
--- a/Demo/pdist/security.py
+++ b/Demo/pdist/security.py
@@ -1,33 +1,33 @@
 class Security:
 
-	def __init__(self):
-		import os
-		env = os.environ
-		if env.has_key('PYTHON_KEYFILE'):
-			keyfile = env['PYTHON_KEYFILE']
-		else:
-			keyfile = '.python_keyfile'
-			if env.has_key('HOME'):
-				keyfile = os.path.join(env['HOME'], keyfile)
-			if not os.path.exists(keyfile):
-				import sys
-				for dir in sys.path:
-					kf = os.path.join(dir, keyfile)
-					if os.path.exists(kf):
-						keyfile = kf
-						break
-		try:
-			self._key = eval(open(keyfile).readline())
-		except IOError:
-			raise IOError, "python keyfile %s: cannot open" % keyfile
+    def __init__(self):
+        import os
+        env = os.environ
+        if env.has_key('PYTHON_KEYFILE'):
+            keyfile = env['PYTHON_KEYFILE']
+        else:
+            keyfile = '.python_keyfile'
+            if env.has_key('HOME'):
+                keyfile = os.path.join(env['HOME'], keyfile)
+            if not os.path.exists(keyfile):
+                import sys
+                for dir in sys.path:
+                    kf = os.path.join(dir, keyfile)
+                    if os.path.exists(kf):
+                        keyfile = kf
+                        break
+        try:
+            self._key = eval(open(keyfile).readline())
+        except IOError:
+            raise IOError, "python keyfile %s: cannot open" % keyfile
 
-	def _generate_challenge(self):
-		import random
-		return random.randint(100, 100000)
+    def _generate_challenge(self):
+        import random
+        return random.randint(100, 100000)
 
-	def _compare_challenge_response(self, challenge, response):
-		return self._encode_challenge(challenge) == response
+    def _compare_challenge_response(self, challenge, response):
+        return self._encode_challenge(challenge) == response
 
-	def _encode_challenge(self, challenge):
-		p, m = self._key
-		return pow(long(challenge), p, m)
+    def _encode_challenge(self, challenge):
+        p, m = self._key
+        return pow(long(challenge), p, m)