Why does the LDS Church have an "Intellectual Reserve, Inc." copyright on its manuals and other publications?
This name replaced "Corporation of the President of The Church of Jesus Christ of Latter-day Saints" at the beginning of the 21st Century, likely around 2001 or 2002.
Nothing to worry about here.
A bunch of church attorneys chose the name and purely for legal reasons to keep up with the times.
Despite the "Sunstone-ish" sounding copyright, there's nothing to read into here.