What Does "Royalty Free Music" Really Mean?

Royalty Free Music is a body of works which is licensed with a bundle of rights for one up front fee.  Generally the term is 50- 99 years hence the alternative term "Lifetime Blanket".  When music is licensed by the individual use or production, it is "needle drop" or "laser drop" music.  Challenge those that call themselves "royalty free music" libraries when in fact they are "needle drop" libraries.  Be wary of re-titled music and music simply being merchandised or retailed by "libraries" that have no actual involvement in music creation.