One of the problems for Rick and Groupee is the fact that people remove and alter the copyright against the agreement that everyone makes when they purchase the script.
I think by putting it into the language file will make it easier for people to change the wording, whereas at the moment users have to physically alter a file.
The only way this would perhaps work is if the language file was not directly editable from the CP.
There are two sides to also displaying the version. It makes it easy to see which version is being run. I am also not sure that it is a security risk as it is the site owners responsibility to upgrade to the latest version. If owners do not update their scripts, I am not sure that Groupee can be held responsible for versions that have reached their EOL. Groupee have a responsibility to ensure that the latest version (currently 7.3) is free of any security holes, but not versions that are 2 or 3 versions old.
I am only speaking from my own thoughts on the subject, and do not know what the company line is.
