copyright of files on tutorial files!

Good Morning…
i was just wondering, what are the copyrights of the old tutorial files that came with blender (like that nice 6 legged spider which demonstrated IKA)?
can i use them freely (on a web site,… etc). or should i look for the authors first? (where can i find them?)

thank you very much in advance…

You can probobly use them, but the least you need to do is give credit to the author.