diff --git a/include/osgDB/DatabaseRevisions b/include/osgDB/DatabaseRevisions
new file mode 100644
index 000000000..a480f7e6a
--- /dev/null
+++ b/include/osgDB/DatabaseRevisions
@@ -0,0 +1,76 @@
+/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield 
+ *
+ * This library is open source and may be redistributed and/or modified under  
+ * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or 
+ * (at your option) any later version.  The full license is in LICENSE file
+ * included with this distribution, and on the openscenegraph.org website.
+ * 
+ * This library 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 
+ * OpenSceneGraph Public License for more details.
+*/
+
+#ifndef OSGDB_DATABASEREVISIONS
+#define OSGDB_DATABASEREVISIONS 1
+
+#include <osg/Node>
+
+#include <osgDB/ReaderWriter>
+
+#include <set>
+
+namespace osgDB {
+
+
+class OSGDB_EXPORT DatabaseRevision : public osg::Object
+{
+    public:
+
+        DatabaseRevision();
+        DatabaseRevision(const DatabaseRevision& revision, const osg::CopyOp=osg::CopyOp::SHALLOW_COPY);
+
+        META_Object(osgDB, DatabaseRevision)
+
+        typedef std::set<std::string> FileNames;
+
+        FileNames& getFilesAdded() { return _filesAdded; }
+        FileNames& getFilesRemoved() { return _filesRemoved; }
+        FileNames& getFilesModified() { return _filesModified; }
+
+        bool isFileBlackListed(const std::string& filename) const;
+
+    protected:
+
+        virtual ~DatabaseRevision();
+
+        FileNames _filesAdded;
+        FileNames _filesRemoved;
+        FileNames _filesModified;
+};
+
+class OSGDB_EXPORT DatabaseRevisions : public osg::Object
+{
+    public:
+
+        DatabaseRevisions();
+        DatabaseRevisions(const DatabaseRevisions& revisions, const osg::CopyOp=osg::CopyOp::SHALLOW_COPY);
+
+        META_Object(osgDB, DatabaseRevisions)
+
+        typedef std::vector< osg::ref_ptr<DatabaseRevision> > DatabaseRevisionList;
+
+        DatabaseRevisionList& getDatabaseRevisionList() { return _revisionList; }
+
+        bool isFileBlackListed(const std::string& filename) const;
+
+    protected:
+
+        virtual ~DatabaseRevisions();
+
+        DatabaseRevisionList _revisionList;
+};
+
+}
+
+#endif
diff --git a/include/osgDB/FileCache b/include/osgDB/FileCache
index 1fa264de2..dd56661a2 100644
--- a/include/osgDB/FileCache
+++ b/include/osgDB/FileCache
@@ -17,6 +17,9 @@
 #include <osg/Node>
 
 #include <osgDB/ReaderWriter>
+#include <osgDB/DatabaseRevisions>
+
+#include <set>
 
 namespace osgDB {
 
@@ -49,12 +52,20 @@ class OSGDB_EXPORT FileCache : public osg::Referenced
         virtual ReaderWriter::ReadResult readShader(const std::string& originalFileName, const osgDB::Options* options) const;
         virtual ReaderWriter::WriteResult writeShader(const osg::Shader& shader, const std::string& originalFileName, const osgDB::Options* options) const;
 
+
+        typedef std::list< osg::ref_ptr<DatabaseRevisions> > DatabaseRevisionsList;
+        DatabaseRevisionsList& getDatabaseRevisionsList() { return _databaseRevisionsList; }
+
+        bool isCachedFileBlackListed(const std::string& originalFileName) const;
+
     protected:
 
         virtual ~FileCache();
 
         std::string _fileCachePath;
 
+        DatabaseRevisionsList _databaseRevisionsList;
+
 };
 
 }
diff --git a/src/osgDB/CMakeLists.txt b/src/osgDB/CMakeLists.txt
index 052d7baf0..35dd231cb 100644
--- a/src/osgDB/CMakeLists.txt
+++ b/src/osgDB/CMakeLists.txt
@@ -24,6 +24,7 @@ SET(LIB_PUBLIC_HEADERS
     ${HEADER_PATH}/Callbacks
     ${HEADER_PATH}/ConvertUTF
     ${HEADER_PATH}/DatabasePager
+    ${HEADER_PATH}/DatabaseRevisions
     ${HEADER_PATH}/DotOsgWrapper
     ${HEADER_PATH}/DynamicLibrary
     ${HEADER_PATH}/Export
@@ -60,6 +61,7 @@ ADD_LIBRARY(${LIB_NAME}
     Callbacks.cpp
     ConvertUTF.cpp
     DatabasePager.cpp
+    DatabaseRevisions.cpp
     DotOsgWrapper.cpp
     DynamicLibrary.cpp
     Field.cpp
diff --git a/src/osgDB/DatabaseRevisions.cpp b/src/osgDB/DatabaseRevisions.cpp
new file mode 100644
index 000000000..b57013271
--- /dev/null
+++ b/src/osgDB/DatabaseRevisions.cpp
@@ -0,0 +1,74 @@
+/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield 
+ *
+ * This library is open source and may be redistributed and/or modified under  
+ * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or 
+ * (at your option) any later version.  The full license is in LICENSE file
+ * included with this distribution, and on the openscenegraph.org website.
+ * 
+ * This library 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 
+ * OpenSceneGraph Public License for more details.
+*/
+
+#include <osgDB/DatabaseRevisions>
+#include <osgDB/FileUtils>
+#include <osgDB/FileNameUtils>
+#include <osgDB/ReadFile>
+#include <osgDB/WriteFile>
+
+using namespace osgDB;
+
+////////////////////////////////////////////////////////////////////////////////////////////
+//
+// DatabaseRevision
+//
+DatabaseRevision::DatabaseRevision()
+{
+}
+
+DatabaseRevision::DatabaseRevision(const DatabaseRevision& revision, const osg::CopyOp):
+    _filesAdded(revision._filesAdded),
+    _filesRemoved(revision._filesRemoved),
+    _filesModified(revision._filesModified)
+{
+}
+
+DatabaseRevision::~DatabaseRevision()
+{
+}
+
+bool DatabaseRevision::isFileBlackListed(const std::string& filename) const
+{
+    return _filesRemoved.count(filename)!=0 || _filesModified.count(filename)!=0;
+}
+
+
+////////////////////////////////////////////////////////////////////////////////////////////
+//
+// DatabaseRevisions
+//
+DatabaseRevisions::DatabaseRevisions()
+{
+}
+
+DatabaseRevisions::DatabaseRevisions(const DatabaseRevisions& revisions, const osg::CopyOp):
+    _revisionList(revisions._revisionList)
+{
+}
+
+DatabaseRevisions::~DatabaseRevisions()
+{
+}
+
+bool DatabaseRevisions::isFileBlackListed(const std::string& filename) const
+{
+    for(DatabaseRevisionList::const_iterator itr = _revisionList.begin();
+        itr != _revisionList.end();
+        ++itr)
+    {
+        if ((*itr)->isFileBlackListed(filename)) return true;
+    }
+    return false;
+}
+
diff --git a/src/osgDB/FileCache.cpp b/src/osgDB/FileCache.cpp
index 5a0a8bc49..065d5eccb 100644
--- a/src/osgDB/FileCache.cpp
+++ b/src/osgDB/FileCache.cpp
@@ -19,6 +19,10 @@
 
 using namespace osgDB;
 
+////////////////////////////////////////////////////////////////////////////////////////////
+//
+// FileCache
+//
 FileCache::FileCache(const std::string& path):
     _fileCachePath(path)
 {
@@ -40,15 +44,19 @@ std::string FileCache::createCacheFileName(const std::string& originalFileName)
     std::string cacheFileName = _fileCachePath + "/" + 
                                 osgDB::getServerAddress(originalFileName) + "/" + 
                                 osgDB::getServerFileName(originalFileName);
-                                
+
     osg::notify(osg::INFO)<<"FileCache::createCacheFileName("<<originalFileName<<") = "<<cacheFileName<<std::endl;
-    
+
     return cacheFileName;
 }
 
 bool FileCache::existsInCache(const std::string& originalFileName) const
 {
-    return osgDB::fileExists(createCacheFileName(originalFileName));
+    if (osgDB::fileExists(createCacheFileName(originalFileName)))
+    {   
+        return !isCachedFileBlackListed(originalFileName);
+    }
+    return false;
 }
 
 ReaderWriter::ReadResult FileCache::readObject(const std::string& originalFileName, const osgDB::Options* options) const
@@ -216,3 +224,15 @@ ReaderWriter::WriteResult FileCache::writeShader(const osg::Shader& shader, cons
     }
     return ReaderWriter::WriteResult::FILE_NOT_HANDLED;
 }
+
+
+bool FileCache::isCachedFileBlackListed(const std::string& originalFileName) const
+{
+    for(DatabaseRevisionsList::const_iterator itr = _databaseRevisionsList.begin();
+        itr != _databaseRevisionsList.end();
+        ++itr)
+    {
+        if ((*itr)->isFileBlackListed(originalFileName)) return true;
+    }
+    return false;
+}