First, it isn't clear from the original post whether the suppression is meant during processing directly issued by the original poster, or by somebody else (like a customer, etc.). However, even if it is the latter, there are other ways to give the appropriate credits (like proper documentation, etc.), i.e. suppression of the copyright message is not necessarily a problem.
Hence my suggestion of excluding it using grep etc., where at the very least the fact that somebody was specifically dropping messages would be visible to anybody who had the relevant script file (and OP's mention of stdout suggested he was aware of such things).
Second, FPC license provides specific information on what is allowed and/or required; always displaying the copyright on every run of FPC is not required there.
I think the bottom line is that since the compiler has supplied a way of suppressing the messages the developers aren't too unhappy about it being done.
Finally, I'd like to apologise to OP: I wasn't trying to "blow the whistle" or anything like that, but I wanted to make sure that the filtering suggestion I'd made didn't rub anybody up the wrong way.
MarkMLl
p.s. I can't see a "Request Immediate Community Attention" link, and once a message drops off the "Recent" pane it's likely to be overlooked by many.