diff --git a/pywidevine/exceptions.py b/pywidevine/exceptions.py
new file mode 100644
index 0000000..682bc93
--- /dev/null
+++ b/pywidevine/exceptions.py
@@ -0,0 +1,34 @@
+class PyWidevineException(Exception):
+    """Exceptions used by pywidevine."""
+
+
+class TooManySessions(PyWidevineException):
+    """Too many Sessions are open."""
+
+
+class InvalidSession(PyWidevineException):
+    """No Session is open with the specified identifier."""
+
+
+class InvalidInitData(PyWidevineException):
+    """The Widevine Cenc Header Data is invalid or empty."""
+
+
+class InvalidLicenseType(PyWidevineException):
+    """The License Type is an Invalid Value."""
+
+
+class InvalidLicenseMessage(PyWidevineException):
+    """The License Message is Invalid or Missing."""
+
+
+class InvalidContext(PyWidevineException):
+    """The Context is Invalid or Missing."""
+
+
+class SignatureMismatch(PyWidevineException):
+    """The Signature did not match."""
+
+
+class NoKeysLoaded(PyWidevineException):
+    """No License was parsed for this Session, No Keys available."""