Permission to implement copyrighted algorithm

[Phil Steitz <ph...@gmail.com>]

In Commons Math we have developed a Java implementation of the 
algorithm presented here:
http://www.fon.hum.uva.nl/Service/Statistics/Signed_Rank_Algorihms.html#C

The Java code could be viewed as a translation of the perl code used 
to describe the algorithm.  The author provides C and perl 
implementations and states that

"These programs can be used and distributed freely. (copyright 1996, 
Rob van Son)"

Do we need a grant of any kind from the author or can we just 
include the derivative Java code with attribution of the algorithm 
in the javadoc and NOTICE.txt?

Thanks!

Phil

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