slartabartfast
Guitarhacker
The best option is to use loops and programs that allow you to use their content license free in your original works no matter what the application.
In most of the world, as soon as content is recorded it is copyrighted. There is no mechanism for the author of a work to extinguish the copyright that automatically attaches. Consequently, there is no way that anyone can allow you to use their copyrighted content "license free." If they say that you can use it, that statement is itself a license.
That's what I meant when I said "license free". I use Band in a Box for much of the music I create...at least some of their tracks. The license from PG says that I can use the samples and content created by it's program in any project for any reason without further license requirements. Cakewalk does the same with it's loops and samples.
Publishers and libraries require that the composer own 100% of the rights. They rely on the writer to have obtained or naturally possess those rights. Using PG products & Cakewalk loops and synths and samples assures me that's a done deal.