Please note, Allen, that only LSC members can post to the LSC forum, so if you need a response from someone else, you need to post in another forum. Having said that, Chris Dee (LDraw Parts Library Admin) responded (to me via email):
Chris Dee Wrote:I am asking about (a), but not "if" they should have attribution in the history, but "how" that attribution should appear:
We use "0 !HISTORY YYYY-MM-DD {The LEGO Universe Team} Original part shape" for LEGO Universe parts and would like the LSC to rule on the suggestion of
"0 HISTORY YYYY-MM-DD {LEGO Digital Designer} Original part shape" for LDD derived parts.
Your opinion (as a member of the LSC) matters because the LSC controls the Official Library Header Specification.