Jesse, the upstream developer of RT3 assures me that they have no intention of stealing the copyright on code that hasn't been intentionally given to them for the purpose of inclusion in RT. He's in consultation with Best Practical's lawyers about how best to re-word it to reflect their intentions.
Regarding the concept of taking the copyright of code: it's what the FSF have been doing since 1992 with Emacs. The difference here is that if you feel strongly about it, you get to keep your copyright.
