Erlang logo licensing and usage examples

[Kenji Rikitake]

I'd be glad if anyone tells me what is the licensing policies and
procedures for the following logo pictures of Erlang:

http://www.erlang.se/images/Erlanglogo.gif
(well-known "e" sign)

http://www.erlang.org/images/erlang-logo.png
(wow, shaded :))

I'm asking this because it'll be nice if I could wear a shirt with
the Erlang logo.

Regards,
Kenji Rikitake
PS: my apology for asking non-technical question in erlang-questions.