|P is for Practical|
Thanks for your question, it's been asked before and is now clarified in the FAQ:
Q: How much does RPerl cost?
A: RPerl is 100% free-of-charge for all non-commercial use as licensed under the same terms as Perl 5.18.0. This means you can use RPerl at home or at work, but you can't re-sell RPerl without the source code and you can't change the copyright terms.
Does that answer your question?
In reply to Re^2: Perl 5 Optimizing Compiler, Part 10: Kickstarter & Performance Benchmarks