diff --git a/tamper/__init__.py b/tamper/__init__.py
index e69de29bb..0e637aa3b 100644
--- a/tamper/__init__.py
+++ b/tamper/__init__.py
@@ -0,0 +1,2 @@
+# Copyright (c) 2006-2010 sqlmap project (http://sqlmap.sourceforge.net/)
+# See the file doc/COPYING for copying permission.
diff --git a/tamper/charencode.py b/tamper/charencode.py
index 87ccd3f8f..468bbffe4 100644
--- a/tamper/charencode.py
+++ b/tamper/charencode.py
@@ -1,3 +1,6 @@
+# Copyright (c) 2006-2010 sqlmap project (http://sqlmap.sourceforge.net/)
+# See the file doc/COPYING for copying permission.
+
 import re
 import string
 
@@ -8,10 +11,12 @@ value -> urlencode of nonencoded chars in value (e.g., SELECT%20FIELD%20FROM%20T
 """
 def tamper(place, value):
     retVal = value
+
     if value:
         if place != "URI":
             retVal = ""
             i = 0
+
             while i < len(value):
                 if value[i] == '%' and (i < len(value) - 2) and value[i+1] in string.hexdigits and value[i+2] in string.hexdigits:
                     retVal += value[i:i+3]
@@ -21,4 +26,5 @@ def tamper(place, value):
                     i += 1
         else:
             raise sqlmapUnsupportedFeatureException, "can't use tampering module '%s' with 'URI' type injections" % __name__
+
     return retVal
diff --git a/tamper/doubleencode.py b/tamper/doubleencode.py
index 6ca004b03..6f9c646c5 100644
--- a/tamper/doubleencode.py
+++ b/tamper/doubleencode.py
@@ -1,3 +1,6 @@
+# Copyright (c) 2006-2010 sqlmap project (http://sqlmap.sourceforge.net/)
+# See the file doc/COPYING for copying permission.
+
 import re
 
 from lib.core.convert import urlencode
@@ -12,4 +15,5 @@ def tamper(place, value):
             value = urlencode(value)
         else:
             raise sqlmapUnsupportedFeatureException, "can't use tampering module '%s' with 'URI' type injections" % __name__
+
     return value
diff --git a/tamper/ifnull2ifisnull.py b/tamper/ifnull2ifisnull.py
index df4fa4610..74af5639e 100644
--- a/tamper/ifnull2ifisnull.py
+++ b/tamper/ifnull2ifisnull.py
@@ -1,3 +1,6 @@
+# Copyright (c) 2006-2010 sqlmap project (http://sqlmap.sourceforge.net/)
+# See the file doc/COPYING for copying permission.
+
 import re
 
 from lib.core.convert import urldecode
@@ -7,14 +10,16 @@ from lib.core.convert import urlencode
 IFNULL(A,B) -> IF(ISNULL(A),B,A) (e.g., IFNULL(1,2) -> IF(ISNULL(1),2,1))
 """
 def tamper(place, value):
+
     if value and value.find("IFNULL") > -1:
         if place != "URI":
             value = urldecode(value)
-        #value = re.sub(r"IFNULL\(\({%d}(?P<A>.+?)\){%d},(?P<B>.+?)\)" % (num, num), lambda match: "IF(ISNULL(%s),%s,%s)" % (match.group("A"), match.group("B"), match.group("A")), value)
+
         while value.find("IFNULL(") > -1:
             index = value.find("IFNULL(")
             deepness = 1
             comma, end = None, None
+
             for i in xrange(index + len("IFNULL("), len(value)):
                 if deepness == 1 and value[i] == ',':
                     comma = i
@@ -25,6 +30,7 @@ def tamper(place, value):
                     deepness += 1
                 elif value[i] == ')':
                     deepness -= 1
+
             if comma and end:
                 A = value[index + len("IFNULL("):comma]
                 B = value[comma + 1:end]
@@ -32,6 +38,8 @@ def tamper(place, value):
                 value = value[:index] + newVal + value[end+1:]
             else:
                 break
+
         if place != "URI":
             value = urlencode(value)
+
     return value
diff --git a/tamper/randomblanks.py b/tamper/randomblanks.py
index e46aa7148..fcd2ce45a 100644
--- a/tamper/randomblanks.py
+++ b/tamper/randomblanks.py
@@ -1,3 +1,6 @@
+# Copyright (c) 2006-2010 sqlmap project (http://sqlmap.sourceforge.net/)
+# See the file doc/COPYING for copying permission.
+
 import re
 import string
 
@@ -11,6 +14,7 @@ value -> value with inserted random blanks (e.g., INSERT->IN/**/S/**/ERT)
 """
 def tamper(place, value):
     retVal = value
+
     if value:
         if place != "URI":
             retVal = urldecode(retVal)
@@ -23,11 +27,14 @@ def tamper(place, value):
 
             if word.upper() in kb.keywords:
                 newWord = word[0]
+
                 for i in xrange(1, len(word) - 1):
                     newWord += "%s%s" % ("/**/" if randomRange(0,1) else "", word[i])
+
                 newWord += word[-1]
                 retVal = retVal.replace(word, newWord)
 
         if place != "URI":
             retVal = urlencode(retVal)
+
     return retVal
diff --git a/tamper/randomcase.py b/tamper/randomcase.py
index bc45d9dbd..74e845283 100644
--- a/tamper/randomcase.py
+++ b/tamper/randomcase.py
@@ -1,3 +1,6 @@
+# Copyright (c) 2006-2010 sqlmap project (http://sqlmap.sourceforge.net/)
+# See the file doc/COPYING for copying permission.
+
 import re
 import string
 
@@ -11,16 +14,20 @@ value -> chars from value with random case (e.g., INSERT->InsERt)
 """
 def tamper(place, value):
     retVal = value
+
     if value:
         if place != "URI":
             retVal = urldecode(retVal)
 
         for match in re.finditer(r"[A-Za-z_]+", retVal):
             word = match.group()
+
             if word.upper() in kb.keywords:
                 newWord = str()
+
                 for i in xrange(len(word)):
                     newWord += word[i].upper() if randomRange(0,1) else word[i].lower()
+
                 retVal = retVal.replace(word, newWord)
 
         if place != "URI":
diff --git a/tamper/space2comment.py b/tamper/space2comment.py
index 5988f7db2..884f5b152 100644
--- a/tamper/space2comment.py
+++ b/tamper/space2comment.py
@@ -1,3 +1,6 @@
+# Copyright (c) 2006-2010 sqlmap project (http://sqlmap.sourceforge.net/)
+# See the file doc/COPYING for copying permission.
+
 import re
 
 from lib.core.convert import urldecode
@@ -8,6 +11,7 @@ from lib.core.convert import urlencode
 """
 def tamper(place, value):
     retVal = value
+
     if value:
         if place != "URI":
             value = urldecode(value)
@@ -21,16 +25,21 @@ def tamper(place, value):
                     firstspace = True
                     retVal += "/**/"
                     continue
+
             elif value[i] == '\'':
                 qoute = not qoute
+
             elif value[i] == '"':
                 doublequote = not doublequote
+
             elif value[i]==" " and not doublequote and not qoute:
                 retVal += "/**/"
                 continue
+
             retVal += value[i]
 
         if place != "URI":
             retVal = urlencode(retVal)
+
     return retVal