Of course it is ridiculous to take down or audit all your music because you want to sell your license. Noone will ever do that.
Therefore the clause effectively amounts to "If you have used this product in a commercial context, you can no longer resell it". And that is actually in my opinion a pretty fair policy - though practically impossible to enforce.
Buy a library, and get completely disappointed by it, never use it in anything - well at least you can resell it and cut your losses. If you're a hobbyist that is just playing around and end up giving up the hobby or needing the cash - fine, you can sell it.
If you bought it for a specific project and then never need it again, you do not get to pass the product on, recoup most of the price and effectively use it in a commercial project for 10$.
That protects hobbyists and disappointed impulse buyers alike, but puts a lid on everyone passing used licenses of sample packs around indiscriminately.
Also it protects the potential buyer of a used copy and puts the legal burden on the seller - if you have bought a used copy of a library, you get to keep it, you bought it fair and square. If the seller was not allowed to sell it, *they* are liable for not taking down their commercial releases.
That's different from the situation where if you bought a second-hand Spitfire license in the end you actually don't own the license, because it was non-transferable. In the latter situation you have to go after your cash, in the former you got a legitimate license and the company goes after the seller (if they want). Pretty cool mechanism, actually.
Therefore the clause effectively amounts to "If you have used this product in a commercial context, you can no longer resell it". And that is actually in my opinion a pretty fair policy - though practically impossible to enforce.
Buy a library, and get completely disappointed by it, never use it in anything - well at least you can resell it and cut your losses. If you're a hobbyist that is just playing around and end up giving up the hobby or needing the cash - fine, you can sell it.
If you bought it for a specific project and then never need it again, you do not get to pass the product on, recoup most of the price and effectively use it in a commercial project for 10$.
That protects hobbyists and disappointed impulse buyers alike, but puts a lid on everyone passing used licenses of sample packs around indiscriminately.
Also it protects the potential buyer of a used copy and puts the legal burden on the seller - if you have bought a used copy of a library, you get to keep it, you bought it fair and square. If the seller was not allowed to sell it, *they* are liable for not taking down their commercial releases.
That's different from the situation where if you bought a second-hand Spitfire license in the end you actually don't own the license, because it was non-transferable. In the latter situation you have to go after your cash, in the former you got a legitimate license and the company goes after the seller (if they want). Pretty cool mechanism, actually.