[Clipart] Licence problems?

[openclipart-j9s3z-list at raf256.org]

Hello,
first thanks for nice project and good work :)

But I find some difficulties for practical usage of OpenClipart.org
resources.

In example, I am writting small application and I want some simple
graphic for icons, like "save" "load" "password" "lock" "delete" and so
on. And now

1. I have trouble finding such images, IMHO the search engine could be
improved or redesigned some how

2. License... Most resource do not have any License informations, so I
do not know.. can I use them in commercial project?

Thanks
Rafal Maj