diff --git a/drm/common/DrmSupportInfo.cpp b/drm/common/DrmSupportInfo.cpp
index 3e02093..c0bff0e 100644
--- a/drm/common/DrmSupportInfo.cpp
+++ b/drm/common/DrmSupportInfo.cpp
@@ -45,7 +45,7 @@
     for (unsigned int i = 0; i < mMimeTypeVector.size(); i++) {
         const String8 item = mMimeTypeVector.itemAt(i);
 
-        if (String8("") != mimeType && item.find(mimeType) != -1) {
+        if (!strcasecmp(item.string(), mimeType.string())) {
             return true;
         }
     }
@@ -56,7 +56,7 @@
     for (unsigned int i = 0; i < mFileSuffixVector.size(); i++) {
         const String8 item = mFileSuffixVector.itemAt(i);
 
-        if (item.find(fileType) != -1) {
+        if (!strcasecmp(item.string(), fileType.string())) {
             return true;
         }
     }
diff --git a/drm/drmserver/Android.mk b/drm/drmserver/Android.mk
index 5df2ff8..f94f9a3 100644
--- a/drm/drmserver/Android.mk
+++ b/drm/drmserver/Android.mk
@@ -19,8 +19,7 @@
 LOCAL_SRC_FILES:= \
     main_drmserver.cpp \
     DrmManager.cpp \
-    DrmManagerService.cpp \
-    StringTokenizer.cpp
+    DrmManagerService.cpp
 
 LOCAL_SHARED_LIBRARIES := \
     libutils \
diff --git a/drm/drmserver/StringTokenizer.cpp b/drm/drmserver/StringTokenizer.cpp
deleted file mode 100644
index 2130a00..0000000
--- a/drm/drmserver/StringTokenizer.cpp
+++ /dev/null
@@ -1,66 +0,0 @@
-/*
- * Copyright (C) 2010 The Android Open Source Project
- *
- * 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.
- */
-
-#include "StringTokenizer.h"
-
-using namespace android;
-
-StringTokenizer::StringTokenizer(const String8& string, const String8& delimiter) {
-    splitString(string, delimiter);
-}
-
-void StringTokenizer::splitString(const String8& string, const String8& delimiter) {
-    for (unsigned int i = 0; i < string.length(); i++) {
-        unsigned int position = string.find(delimiter.string(), i);
-        if (string.length() != position) {
-            String8 token(string.string()+i, position-i);
-            if (token.length()) {
-                mStringTokenizerVector.push(token);
-                i = position + delimiter.length() - 1;
-            }
-        } else {
-            mStringTokenizerVector.push(String8(string.string()+i, string.length()-i));
-            break;
-        }
-    }
-}
-
-StringTokenizer::Iterator StringTokenizer::iterator() {
-    return Iterator(this);
-}
-
-StringTokenizer::Iterator::Iterator(const StringTokenizer::Iterator& iterator) :
-    mStringTokenizer(iterator.mStringTokenizer),
-    mIndex(iterator.mIndex) {
-}
-
-StringTokenizer::Iterator& StringTokenizer::Iterator::operator=(
-            const StringTokenizer::Iterator& iterator) {
-    mStringTokenizer = iterator.mStringTokenizer;
-    mIndex = iterator.mIndex;
-    return *this;
-}
-
-bool StringTokenizer::Iterator::hasNext() {
-    return mIndex < mStringTokenizer->mStringTokenizerVector.size();
-}
-
-String8& StringTokenizer::Iterator::next() {
-    String8& value = mStringTokenizer->mStringTokenizerVector.editItemAt(mIndex);
-    mIndex++;
-    return value;
-}
-
diff --git a/drm/libdrmframework/include/PlugInManager.h b/drm/libdrmframework/include/PlugInManager.h
index 9ad195f..8029138 100644
--- a/drm/libdrmframework/include/PlugInManager.h
+++ b/drm/libdrmframework/include/PlugInManager.h
@@ -230,11 +230,9 @@
      */
     bool isPlugIn(const struct dirent* pEntry) const {
         String8 sName(pEntry->d_name);
-        int extentionPos = sName.size() - String8(PLUGIN_EXTENSION).size();
-        if (extentionPos < 0) {
-            return false;
-        }
-        return extentionPos == (int)sName.find(PLUGIN_EXTENSION);
+        String8 extension(sName.getPathExtension());
+        // Note that the plug-in extension must exactly match case
+        return extension == String8(PLUGIN_EXTENSION);
     }
 
     /**
diff --git a/drm/libdrmframework/include/StringTokenizer.h b/drm/libdrmframework/include/StringTokenizer.h
deleted file mode 100644
index 70e7558..0000000
--- a/drm/libdrmframework/include/StringTokenizer.h
+++ /dev/null
@@ -1,87 +0,0 @@
-/*
- * Copyright (C) 2010 The Android Open Source Project
- *
- * 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.
- */
-
-#ifndef __STRING_TOKENIZER_H__
-#define __STRING_TOKENIZER_H__
-
-#include <drm/drm_framework_common.h>
-
-namespace android {
-
-/**
- * This is an utility class for String manipulation.
- *
- */
-class StringTokenizer {
-public:
-    /**
-     * Iterator for string tokens
-     */
-    class Iterator {
-        friend class StringTokenizer;
-    private:
-        Iterator(StringTokenizer* StringTokenizer)
-         : mStringTokenizer(StringTokenizer), mIndex(0) {}
-
-    public:
-        Iterator(const Iterator& iterator);
-        Iterator& operator=(const Iterator& iterator);
-        virtual ~Iterator() {}
-
-    public:
-        bool hasNext();
-        String8& next();
-
-    private:
-        StringTokenizer* mStringTokenizer;
-        unsigned int mIndex;
-    };
-
-public:
-    /**
-     * Constructor for StringTokenizer
-     *
-     * @param[in] string Complete string data
-     * @param[in] delimeter Delimeter used to split the string
-     */
-    StringTokenizer(const String8& string, const String8& delimeter);
-
-    /**
-     * Destructor for StringTokenizer
-     */
-    ~StringTokenizer() {}
-
-private:
-    /**
-     * Splits the string according to the delimeter
-     */
-    void splitString(const String8& string, const String8& delimeter);
-
-public:
-    /**
-     * Returns Iterator object to walk through the split string values
-     *
-     * @return Iterator object
-     */
-    Iterator iterator();
-
-private:
-    Vector<String8> mStringTokenizerVector;
-};
-
-};
-#endif /* __STRING_TOKENIZER_H__ */
-