updated LICENSE

LICENSE

@@ -23,3 +23,14 @@
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+Friendika incorporates other software which may be licensed under different 
+terms and conditions. Some system libraries which are supplied with Friendika
+are provided under the LGPL and may result in legal encumberance if you make 
+any code changes to these libraries. 
+
+Addon or "plugin" modules (within the 'addon' directory) are licensed under
+terms provided by the respective software author or authors, and MAY include
+copyleft licenses such as GPLv3, AGPL, and/or commercial licenses. For the
+purposes of licensing, addon modules are considered separate standalone works.
+