*You can use it freely...but there's a catch and I don't recommend you do it.  You'd have to release the material over on your page to the GNU Free Documentation License.  That makes it available for anyone to use for any reason.  That pretty much voids your copyright.  That's why I do recommend doing something new over on this site in your own words using the other page as a reference.  This gives you an article here and on the mirror sites and protects your original copyright.