diff --git a/spkl/SparkleXrm.Tasks/PluginRegistraton.cs b/spkl/SparkleXrm.Tasks/PluginRegistraton.cs
index 8359c50..640aae8 100644
--- a/spkl/SparkleXrm.Tasks/PluginRegistraton.cs
+++ b/spkl/SparkleXrm.Tasks/PluginRegistraton.cs
@@ -30,10 +30,10 @@ public PluginRegistraton(IOrganizationService service, OrganizationServiceContex
         /// </summary>
         public string SolutionUniqueName { get; set; }
 
-        public void RegisterWorkflowActivities(string path)
+        public void RegisterWorkflowActivities(string path, string publisherPrefix = "")
         {
             var assemblyFilePath = new FileInfo(path);
-            if (Reflection.IgnoredAssemblies.Contains(assemblyFilePath.Name))
+            if (Reflection.IgnoreAssembly(assemblyFilePath, publisherPrefix))
                 return;
             // Load each assembly
             Assembly assembly = Reflection.LoadAssembly(assemblyFilePath.FullName);
@@ -148,11 +148,11 @@ private void AddStepToSolution(string solutionName, SdkMessageProcessingStep sdk
             _service.Execute(addToSolution);
         }
 
-        public void RegisterPlugin(string file, bool excludePluginSteps = false)
+        public void RegisterPlugin(string file, bool excludePluginSteps = false, string publisherPrefix = "")
         {
             var assemblyFilePath = new FileInfo(file);
 
-            if (assemblyFilePath.Name.StartsWith("System.") || Reflection.IgnoredAssemblies.Contains(assemblyFilePath.Name))
+            if (Reflection.IgnoreAssembly(assemblyFilePath, publisherPrefix))
                 return;
 
             // Load each assembly
diff --git a/spkl/SparkleXrm.Tasks/Reflection.cs b/spkl/SparkleXrm.Tasks/Reflection.cs
index c2d2520..8d02e23 100644
--- a/spkl/SparkleXrm.Tasks/Reflection.cs
+++ b/spkl/SparkleXrm.Tasks/Reflection.cs
@@ -6,6 +6,7 @@
 using System.Linq;
 using System.Reflection;
 using System.Text;
+using System.Text.RegularExpressions;
 using System.Threading.Tasks;
 
 namespace SparkleXrm.Tasks
@@ -28,6 +29,8 @@ public class Reflection
             "Microsoft.Rest.ClientRuntime.dll"
         };
 
+        private static Regex _ignoredPublisherRegEx = new Regex("^system|microsoft|newtonsoft|sparklexrm.*/.dll");
+
         public static Assembly LoadAssembly(string path)
         {
             Assembly assembly = null;
@@ -43,6 +46,26 @@ public static Assembly LoadAssembly(string path)
             return assembly;
         }
 
+        public static bool IgnoreAssembly(FileInfo assemblyFilePath, string publisherPrefix = "", bool onlyPublisherAssemblies = false)
+        {
+            var assemblyName = assemblyFilePath.Name.ToLower();
+
+            // if publisher prefix is specified we consider assemblies starting with this prefix OK to deploy
+            if (!string.IsNullOrEmpty(publisherPrefix))
+            {
+                if (assemblyName.StartsWith(publisherPrefix.ToLower()))
+                {
+                    return false;
+                }
+                else if (onlyPublisherAssemblies)
+                {
+                    return true; // ignore other assemblies if the corresponding flag is raised
+                }
+            }
+
+            return _ignoredPublisherRegEx.IsMatch(assemblyName);
+        }
+
         public static IEnumerable<Type> GetTypesImplementingInterface(Assembly assembly, Type interfaceName)
         {
             var types = assembly.ExportedTypes.Where(p => p.GetInterfaces().FirstOrDefault(a => a.Name == interfaceName.Name) != null);
diff --git a/spkl/SparkleXrm.Tasks/Tasks/DeployPluginsTask.cs b/spkl/SparkleXrm.Tasks/Tasks/DeployPluginsTask.cs
index 77c96dc..b6676a2 100644
--- a/spkl/SparkleXrm.Tasks/Tasks/DeployPluginsTask.cs
+++ b/spkl/SparkleXrm.Tasks/Tasks/DeployPluginsTask.cs
@@ -16,6 +16,8 @@ public class DeployPluginsTask : BaseTask
     {
         public bool ExcludePluginSteps { get; set; }
 
+        public string PublisherPrefix { get; set; }
+
         public DeployPluginsTask(IOrganizationService service, ITrace trace) : base(service, trace)
         {
           
@@ -57,7 +59,7 @@ private void DeployPlugins(OrganizationServiceContext ctx, ConfigFile config)
                 {
                     try
                     {
-                        pluginRegistration.RegisterPlugin(assemblyFilePath, ExcludePluginSteps);
+                        pluginRegistration.RegisterPlugin(assemblyFilePath, ExcludePluginSteps, PublisherPrefix);
                     }
 
                     catch (ReflectionTypeLoadException ex)
diff --git a/spkl/SparkleXrm.Tasks/Tasks/DeployWorkflowActivitiesTask.cs b/spkl/SparkleXrm.Tasks/Tasks/DeployWorkflowActivitiesTask.cs
index 51019cd..ec1af5b 100644
--- a/spkl/SparkleXrm.Tasks/Tasks/DeployWorkflowActivitiesTask.cs
+++ b/spkl/SparkleXrm.Tasks/Tasks/DeployWorkflowActivitiesTask.cs
@@ -13,6 +13,8 @@ namespace SparkleXrm.Tasks
 {
     public class DeployWorkflowActivitiesTask : BaseTask
     {
+        public string PublisherPrefix { get; set; }
+
         public DeployWorkflowActivitiesTask(IOrganizationService service, ITrace trace) : base(service, trace)
         {
         }
@@ -49,7 +51,7 @@ private void DeployWorkflowActivities(OrganizationServiceContext ctx, ConfigFile
                 {
                     try
                     {
-                        pluginRegistration.RegisterWorkflowActivities(assemblyFilePath);
+                        pluginRegistration.RegisterWorkflowActivities(assemblyFilePath, PublisherPrefix);
                     }
                     catch (ReflectionTypeLoadException ex)
                     {
diff --git a/spkl/spkl/Program.cs b/spkl/spkl/Program.cs
index f314b44..65e23af 100644
--- a/spkl/spkl/Program.cs
+++ b/spkl/spkl/Program.cs
@@ -325,12 +325,18 @@ private static void RunTask(CommandLineArgs arguments, IOrganizationService serv
                 case "plugins":
                     trace.WriteLine("Deploying Plugins");
                     task = new DeployPluginsTask(service, trace)
-                    { ExcludePluginSteps = arguments.ExcludePluginSteps };
+                    {
+                        ExcludePluginSteps = arguments.ExcludePluginSteps,
+                        PublisherPrefix = arguments.Prefix
+                    };
                     break;
 
                 case "workflow":
                     trace.WriteLine("Deploying Custom Workflow Activities");
-                    task = new DeployWorkflowActivitiesTask(service, trace);
+                    task = new DeployWorkflowActivitiesTask(service, trace)
+                    {
+                        PublisherPrefix = arguments.Prefix
+                    };
                     break;
 
                 case "webresources":