C5 algorithm implementation?

Do you know where can I find some information of this algorithm, to study it??. Is there already an example of its implementation, or开发者_如何学JAVA, only Quinlan knows its implementation??

His company, rulequest, has it: http://rulequest.com/GPL/C50.tgz

C5.0 which Quinlan is commercially selling is an improvement on C4.5.

According to this sentence from the wikipedia page this algorithm is not open for everyone. I guess it will take some effort to get something going by yourself.

The single threaded version is available under the GPL license. :)