@fudge is not the only one who didn't get his music approved due to the use of sample libraries. I've seen a few others who had this same problem...
We need more information from Fudge. Without that information, don't assume Routenote was saying "We detected you used Spitfire Studio Strings Pro in your original composition" because that's not how Content ID works. Assume Routenote was saying they detected a loop/pattern that sounds too close to one that someone else used in a composition. In Fudge's case, it could have easily been a false trip anyway; Content ID thought it was hearing the same song, but human analysis would know better.
For example DistroKid speaks explicitly of sample libraries here
Distributors don't use the term "sample libraries" the same way VI composers do. We use "sample library" to define virtual instruments created from sampled notes. Distributors use that term to define sampled loops/beats/audio clips, which are also commonly purchased as "libraries."
VI-Control is a unique place, because it is comprised of hundreds composers and songwriters who use virtual instruments (whether they be sampled, synthesized, or modeled) to create music from scratch. We refer to virtual instrument libraries created from sampled notes as "sample libraries". But once you leave VI-Control, the rest of the world is comprised of tens of thousands of bedroom producers using prerecorded beats/loops to create songs. They buy their beats/loops from libraries as well. The term "sample" simply carried over from the days of using audio clips of other bands' recordings.
Distributors could add a clause specifically allowing sample libraries
as we VI composers know them, but they don't because it would open up a can of worms as many virtual instruments contain ostinato patterns, grooves, runs, etc. which could potentially trip Content ID. So they blanket everything with the term "sample library".
I don’t think there is a difference.
Technically this is correct. The samples we trigger in virtual instrument libraries are intellectual property we don't own, which is no different than the audio we listen to when we buy our favorite band's albums. The main difference is that when we buy a sampled virtual instrument, we are automatically granted a license to use that audio to create and release new music.
But I don't want to see VI composers scared of uploading their original music because they used sampled virtual instruments. Even though Content ID rules don't specify an exception for sampled virtual instruments, it's my honest opinion that those rules, in all practicality, are
not meant to apply to them.
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TL;DR: If you created an original song from scratch using virtual instrument sample libraries, don't let Content ID terminology scare you into not distributing it. Handle your song no differently than if it were produced in a recording studio with session musicians playing real instruments. Content ID does not care if the violin on your track is Joshua Bell Violin or Joshua Bell himself, because its sole purpose is to prevent copyright violations.