I’ve largely stopped using other sample providers due to their restrictive copyright conditions which limit my licensing possibilties with the finished track. "Royalty Free" and "Copyright Free" they boldly state on the cover in large letters but read the small print and if you can understand it you will find it is not necessarily the case at all.
Spectrasonics are true to their word which is why I continue to use their products and have ditched the rest.
I was recently surprised to learn that a prospective music library would only consider tracks that made use of samples if the owner of such samples signed a letter of authorisation permitting the use of them in the tracks.
Now I guess I’m correct in assuming that despite you guys being so nice and fair and all I’m still not going to be that lucky in getting such a letter and will instead have to either consider submitting my music to other libraries or else stop using samples altogether…