diff --git a/doc/SecureBPMN-metamodel.dia b/doc/SecureBPMN-metamodel.dia
new file mode 100644
index 0000000..2a961f2
Binary files /dev/null and b/doc/SecureBPMN-metamodel.dia differ
diff --git a/doc/SecureBPMN-metamodel.pdf b/doc/SecureBPMN-metamodel.pdf
new file mode 100644
index 0000000..df1be62
Binary files /dev/null and b/doc/SecureBPMN-metamodel.pdf differ
diff --git a/doc/brucker-securebpmn-2013.pdf b/doc/brucker-securebpmn-2013.pdf
new file mode 100644
index 0000000..e8d9087
Binary files /dev/null and b/doc/brucker-securebpmn-2013.pdf differ
diff --git a/doc/brucker.ea-securebpmn-2012.pdf b/doc/brucker.ea-securebpmn-2012.pdf
new file mode 100644
index 0000000..a57378e
Binary files /dev/null and b/doc/brucker.ea-securebpmn-2012.pdf differ