diff --git a/extensions/computation-simulation-impl/src/main/java/org/sybila/parasim/computation/simulation/simulationcore/SimCoreSimulationEngine.java b/extensions/computation-simulation-impl/src/main/java/org/sybila/parasim/computation/simulation/simulationcore/SimCoreSimulationEngine.java
index a5f6c56f..f0dc6d2a 100644
--- a/extensions/computation-simulation-impl/src/main/java/org/sybila/parasim/computation/simulation/simulationcore/SimCoreSimulationEngine.java
+++ b/extensions/computation-simulation-impl/src/main/java/org/sybila/parasim/computation/simulation/simulationcore/SimCoreSimulationEngine.java
@@ -1,3 +1,22 @@
+/**
+ * Copyright 2011-2016, Sybila, Systems Biology Laboratory and individual
+ * contributors by the @authors tag.
+ *
+ * This file is part of Parasim.
+ *
+ * Parasim is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
 package org.sybila.parasim.computation.simulation.simulationcore;
 
 import org.apache.commons.math.ode.DerivativeException;
diff --git a/extensions/computation-simulation-impl/src/main/java/org/sybila/parasim/computation/simulation/simulationcore/SimCoreSimulationEngineFactory.java b/extensions/computation-simulation-impl/src/main/java/org/sybila/parasim/computation/simulation/simulationcore/SimCoreSimulationEngineFactory.java
index 86d1c84b..e513d82c 100644
--- a/extensions/computation-simulation-impl/src/main/java/org/sybila/parasim/computation/simulation/simulationcore/SimCoreSimulationEngineFactory.java
+++ b/extensions/computation-simulation-impl/src/main/java/org/sybila/parasim/computation/simulation/simulationcore/SimCoreSimulationEngineFactory.java
@@ -1,3 +1,22 @@
+/**
+ * Copyright 2011-2016, Sybila, Systems Biology Laboratory and individual
+ * contributors by the @authors tag.
+ *
+ * This file is part of Parasim.
+ *
+ * Parasim is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
 package org.sybila.parasim.computation.simulation.simulationcore;
 
 import org.sybila.parasim.computation.simulation.cpu.SimulationEngine;