If we are taking the name from Obata Sensei's book, he is a holder of many different dan rankings and licences from a number of arts, including... Daito Ryu Aikijujutsu...
A quick update: a little research has disproved this with respect to Daito-ryu.
Obata sensei has no formal training in Daito-ryu, let alone rank or a teaching license.
You can view this thread on the Aikido Journal forum for confirmation of this, from one of Obata sensei's students. Here's the key part:
"Basically, Obata Sensei does not have any formal training in Daito-ryu. As an uchi-deshi at the Yoshinkan under Shioda Sensei, he was exposed to "older" AJJ techniques in addition to the regular curriculum. The book and video were both based on this experience and his own research of Daito-ryu."
http://www.aikidojournal.com/forums/viewtopic.php?t=10373&highlight=toshiro+obataYet another example of the circumspection with which one must treat any claim of experience, rank, teaching qualifications, etc. in Daito-ryu. To reiterate, there are very few bona fide Daito-ryu groups out there, especially outside of Japan.