This is the Creative Commons License that Splice uses. it'll tell you all about how you can use splices sounds, but from the brief look that I took it looks like it can't be used for commercial purposes (things that make you money, like Spotify), however it does say if someone else uses part of the work they must credit you.
keep in mind IANAL
You can download this https://www.adsrsounds.com/product/software/adsr-sample-manager/, add all your libraries, including your splice folder, makes it a li'l easier to access them, as long as the tags are good.