[SR-Users] "SER Getting Started" - what's the copyright and license?

[Olle E. Johansson]

http://kamailio.org/docs/ser-getting-started/SER-GettingStarted.pdf

I'm looking for the authors of this document to find out what license it is published under. It would be nice to be able to use it and update it instead of starting a new "getting started" from scratch. 

Please contact me if you get this message!

Sorry for cross-posting.

/O