A: RPerl is 100% free-of-charge and is licensed under the same terms as Perl 5.18.0. This means you can use RPerl for free at home or at work, but you can't re-sell RPerl without the source code and you can't change the copyright terms.
Wrong again my friend, but entertaining nevertheless!
~ Will the Chill
Re^2: Perl 5 Optimizing Compiler, Part 10: Kickstarter & Performance Benchmarks