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They are available for commercial use for free, but under the CC-Attribution License.
Has anyone incorporated CC-Attribution artwork in a t-shirt they've sold? What was the reaction from the customer? (I'm assuming there was attribution to vectorportal.com on the final product).
can the wording or picture be changed on the vectors?
Anything can be changed with a vector. The only issue you will come across is most likely the text isn't text anymore (curves / objects or outlines) and you will have to retype any words and match the font styles.
Which of these is free for commercial use. Just thought I would ask to speed up searches when people see this post. "free" is often a trap to catch people who don't read the licensing print and then start selling stuff that started with a free (small print for personal or web use w/o changes) vectors. There are short codes for license types on most sites. So take the time to read before you use for commercial and get burnt.
free vectors 
