Sometimes I see printed on releases:
℗ & © XXXX ALL RIGHTS RESERVED
Where XXXX is a year date.
When having a label name instead of an ALL RIGHTS RESERVED, we can set phonographic copyright (℗) and copyright (©) release-label relationships with start=end=XXXX.
Missing these relationships, I miss the copyright dates.
Especially interesting when I am often missing the release date.
But how to set it, in this case?