diff --git a/Confuser.Core/ConfuserAssemblyResolver.cs b/Confuser.Core/ConfuserAssemblyResolver.cs
index 05ef4731f..2fced6a6b 100644
--- a/Confuser.Core/ConfuserAssemblyResolver.cs
+++ b/Confuser.Core/ConfuserAssemblyResolver.cs
@@ -81,7 +81,7 @@ public void Clear() {
 
 			/// <inheritdoc />
 			public bool Remove(string item) =>
-				_lists.Aggregate(true, (current, list) => current | list.Remove(item));
+				_lists.Aggregate(false, (current, list) => current | list.Remove(item));
 
 			/// <inheritdoc />
 			public int Count => _lists[0].Count;
diff --git a/Confuser.Core/ConfuserEngine.cs b/Confuser.Core/ConfuserEngine.cs
index 03c616d46..741efbf79 100644
--- a/Confuser.Core/ConfuserEngine.cs
+++ b/Confuser.Core/ConfuserEngine.cs
@@ -62,8 +62,10 @@ static ConfuserEngine() {
 		///     <paramref name="parameters" />.Project is <c>null</c>.
 		/// </exception>
 		public static Task Run(ConfuserParameters parameters, CancellationToken? token = null) {
+			if (parameters == null)
+				throw new ArgumentNullException(nameof(parameters));
 			if (parameters.Project == null)
-				throw new ArgumentNullException("parameters");
+				throw new ArgumentNullException(nameof(parameters));
 			if (token == null)
 				token = new CancellationTokenSource().Token;
 			return Task.Factory.StartNew(() => RunInternal(parameters, token.Value), token.Value);
@@ -136,7 +138,7 @@ static void RunInternal(ConfuserParameters parameters, CancellationToken token)
 
 				// 4. Load modules
 				context.Logger.Info("Loading input modules...");
-				marker.Initalize(prots, packers);
+				marker.Initialize(prots, packers);
 				MarkerResult markings = marker.MarkProject(context.Project, context);
 				context.Modules = new ModuleSorter(markings.Modules).Sort().ToList().AsReadOnly();
 				foreach (var module in context.Modules)
@@ -156,7 +158,7 @@ static void RunInternal(ConfuserParameters parameters, CancellationToken token)
 						comp.Initialize(context);
 					}
 					catch (Exception ex) {
-						context.Logger.ErrorException("Error occured during initialization of '" + comp.Name + "'.", ex);
+						context.Logger.ErrorException("Error occurred during initialization of '" + comp.Name + "'.", ex);
 						throw new ConfuserException(ex);
 					}
 					context.CheckCancellation();
@@ -478,31 +480,36 @@ static IEnumerable<string> GetFrameworkVersions() {
 			using (RegistryKey ndpKey =
 				RegistryKey.OpenRemoteBaseKey(RegistryHive.LocalMachine, "").
 							OpenSubKey(@"SOFTWARE\Microsoft\NET Framework Setup\NDP\")) {
+				if (ndpKey == null) yield break;
 				foreach (string versionKeyName in ndpKey.GetSubKeyNames()) {
 					if (!versionKeyName.StartsWith("v"))
 						continue;
 
-					RegistryKey versionKey = ndpKey.OpenSubKey(versionKeyName);
-					var name = (string)versionKey.GetValue("Version", "");
-					string sp = versionKey.GetValue("SP", "").ToString();
-					string install = versionKey.GetValue("Install", "").ToString();
-					if (install == "" || sp != "" && install == "1")
-						yield return versionKeyName + "  " + name;
-
-					if (name != "")
-						continue;
+					using (RegistryKey versionKey = ndpKey.OpenSubKey(versionKeyName)) {
+						if (versionKey == null) continue;
+						var name = (string)versionKey.GetValue("Version", "");
+						string sp = versionKey.GetValue("SP", "").ToString();
+						string install = versionKey.GetValue("Install", "").ToString();
+						if (install == "" || sp != "" && install == "1")
+							yield return versionKeyName + "  " + name;
 
-					foreach (string subKeyName in versionKey.GetSubKeyNames()) {
-						RegistryKey subKey = versionKey.OpenSubKey(subKeyName);
-						name = (string)subKey.GetValue("Version", "");
 						if (name != "")
-							sp = subKey.GetValue("SP", "").ToString();
-						install = subKey.GetValue("Install", "").ToString();
-
-						if (install == "")
-							yield return versionKeyName + "  " + name;
-						else if (install == "1")
-							yield return "  " + subKeyName + "  " + name;
+							continue;
+
+						foreach (string subKeyName in versionKey.GetSubKeyNames()) {
+							using (RegistryKey subKey = versionKey.OpenSubKey(subKeyName)) {
+								if (subKey == null) continue;
+								name = (string)subKey.GetValue("Version", "");
+								if (name != "")
+									sp = subKey.GetValue("SP", "").ToString();
+								install = subKey.GetValue("Install", "").ToString();
+
+								if (install == "")
+									yield return versionKeyName + "  " + name;
+								else if (install == "1")
+									yield return "  " + subKeyName + "  " + name;
+							}
+						}
 					}
 				}
 			}
diff --git a/Confuser.Core/Marker.cs b/Confuser.Core/Marker.cs
index 70e8a8529..f77c218c3 100644
--- a/Confuser.Core/Marker.cs
+++ b/Confuser.Core/Marker.cs
@@ -56,11 +56,11 @@ public class Marker {
 		protected Dictionary<string, Protection> protections;
 
 		/// <summary>
-		///     Initalizes the Marker with specified protections and packers.
+		///     Initializes the Marker with specified protections and packers.
 		/// </summary>
 		/// <param name="protections">The protections.</param>
 		/// <param name="packers">The packers.</param>
-		public virtual void Initalize(IList<Protection> protections, IList<Packer> packers) {
+		public virtual void Initialize(IList<Protection> protections, IList<Packer> packers) {
 			this.protections = protections.ToDictionary(prot => prot.Id, prot => prot, StringComparer.OrdinalIgnoreCase);
 			this.packers = packers.ToDictionary(packer => packer.Id, packer => packer, StringComparer.OrdinalIgnoreCase);
 		}
diff --git a/Confuser.Core/ProtectionPipeline.cs b/Confuser.Core/ProtectionPipeline.cs
index 406ed3ebc..4146c0a10 100644
--- a/Confuser.Core/ProtectionPipeline.cs
+++ b/Confuser.Core/ProtectionPipeline.cs
@@ -28,7 +28,7 @@ public enum PipelineStage {
 		ProcessModule,
 
 		/// <summary>
-		///     Confuser engine optimizes opcodes of the method bodys.
+		///     Confuser engine optimizes opcodes of the method bodies.
 		///     This stage occurs once per module.
 		/// </summary>
 		OptimizeMethods,
diff --git a/Confuser.Core/Services/RandomService.cs b/Confuser.Core/Services/RandomService.cs
index 9016df741..56f18310b 100644
--- a/Confuser.Core/Services/RandomService.cs
+++ b/Confuser.Core/Services/RandomService.cs
@@ -235,7 +235,7 @@ public RandomService(string seed) {
 		public RandomGenerator GetRandomGenerator(string id) {
 			if (string.IsNullOrEmpty(id))
 				throw new ArgumentNullException("id");
-			byte[] newSeed = seed;
+			byte[] newSeed = (byte[])seed.Clone();
 			byte[] idHash = Utils.SHA256(Encoding.UTF8.GetBytes(id));
 			for (int i = 0; i < 32; i++)
 				newSeed[i] ^= idHash[i];
diff --git a/Confuser.Core/Utils.cs b/Confuser.Core/Utils.cs
index 323b2833c..e941cc1e6 100644
--- a/Confuser.Core/Utils.cs
+++ b/Confuser.Core/Utils.cs
@@ -76,14 +76,14 @@ public static void AddListEntry<TKey, TValue>(this IDictionary<TKey, List<TValue
 		/// <returns>The path of <paramref name="filespec" /> relative to <paramref name="folder" />.</returns>
 		public static string GetRelativePath(string fileSpec, string baseDirectory) {
 			if (fileSpec is null) throw new ArgumentNullException(nameof(fileSpec));
-			if (baseDirectory is null) throw new ArgumentNullException(nameof(fileSpec));
+			if (baseDirectory is null) throw new ArgumentNullException(nameof(baseDirectory));
 
 			return GetRelativePath(new FileInfo(fileSpec), new DirectoryInfo(baseDirectory));
 		}
 
 		public static string GetRelativePath(FileInfo fileSpec, DirectoryInfo baseDirectory) {
 			if (fileSpec is null) throw new ArgumentNullException(nameof(fileSpec));
-			if (baseDirectory is null) throw new ArgumentNullException(nameof(fileSpec));
+			if (baseDirectory is null) throw new ArgumentNullException(nameof(baseDirectory));
 
 			if (baseDirectory.FullName.EndsWith(Path.DirectorySeparatorChar.ToString())) {
 				baseDirectory = new DirectoryInfo(baseDirectory.FullName.TrimEnd(Path.DirectorySeparatorChar));
@@ -117,8 +117,8 @@ public static string NullIfEmpty(this string val) {
 		/// <param name="buffer">The input buffer.</param>
 		/// <returns>The SHA1 hash of the input buffer.</returns>
 		public static byte[] SHA1(byte[] buffer) {
-			var sha = new SHA1Managed();
-			return sha.ComputeHash(buffer);
+			using (var sha = new SHA1Managed())
+				return sha.ComputeHash(buffer);
 		}
 
 		/// <summary>
@@ -143,8 +143,8 @@ public static byte[] Xor(byte[] buffer1, byte[] buffer2) {
 		/// <param name="buffer">The input buffer.</param>
 		/// <returns>The SHA256 hash of the input buffer.</returns>
 		public static byte[] SHA256(byte[] buffer) {
-			var sha = new SHA256Managed();
-			return sha.ComputeHash(buffer);
+			using (var sha = new SHA256Managed())
+				return sha.ComputeHash(buffer);
 		}
 
 		/// <summary>