piecewise polynomial function convolution



Hi list,

I found this link during a search for something else unrelated to the subject of the article.  When I came across it I 
got curious and read it. I may want to use this method with a new pwpolyint(L,x) function. I was wondering if there is a 
copyright on the method of integration they discovered and is it free to use the algorithm.

http://degiorgi.math.hr/~singer/aaa_sem/ZZ_NOT_NOW/970-975.pdf

Any ideas?  Is it worth the effort?

Rich