Consumer, DJ, and label separators split stems for different jobs

The audio task

A producer with a finished stereo mix wants an a cappella or an isolated bassline for a remix, mashup, or DJ set. Doing that without the original multitrack means running the mix through a separation model that estimates vocals, drums, bass, and 'other' from the summed audio. The result is often good enough for creative use, but the separated stem is still, legally, built from someone else's copyrighted recording, and that does not change because the tool that produced it is labelled AI-powered.

What the documents show

The three tools named here describe different intended audiences on their own pages. Serato's Stems page frames the feature as a real-time DJ performance tool built into Serato DJ Pro and Lite, for isolating vocals, melody, bass, or drums while mixing live or recording a set. AudioShake's own site instead segments its product by customer type: an 'Indie' tier for artists and labels, a 'Live' web app for teams and studios, and catalogue-scale separation built around a client's own sonic profile for sync licensing and data services. iZotope's RX 12 Advanced page positions its restoration modules as tools for rescuing dialogue or adjusting a mix element during post-production, not as a remix-stem generator. None of the three pages claims that a separated stem carries a licence to redistribute the underlying recording.

Rights status

Serato's own frequently-asked-questions page, captured in the archived Stems page, states this directly: a licence to use the Stems feature 'only applies to the use of the feature and does not cover the material that it is being applied to,' and a user applying it to copyrighted material must get authorisation from the rights owner first. AudioShake and iZotope do not carry an equivalent statement on the pages reviewed here; their marketing describes what the separation does, not who is allowed to release the result. That silence is not permission, and the source recording's copyright still governs whatever the separated stem is used for.

What to check before you use it

This is an editorial checklist, not legal advice. Before releasing anything built from a separated stem, confirm who owns the source recording and whether a sync, sample, or remix licence exists or is obtainable; check whether the separator's own terms address commercial redistribution, as Serato's do; and note which audience a tool is built for, since a DJ-app separator's real-time convenience is not the same as a B2B platform's catalogue-licensing workflow.

• Does the tool's own FAQ or terms page say anything about rights in the source material?
• Is the separated stem staying inside a private set or DJ mix, or going into a released, distributed track?
• Would a label-facing platform built for catalogue work, rather than a consumer app, be the more defensible choice for this use?

A separator's polish says nothing about the rights status of what it processes; that answer still comes from the source recording's owner, not the software.