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→Source-available software
Whatever reason the dev gives for a non-commercial clause in the software license, it ''should'' be of no consequence to the average end user who's just running a free emulator on their PC for their own use. Some specific circumstances, such as a developer who's making a brand new commercial game for an old system and using an emulator to test it in lieu of real hardware, ''might'' be exceptions to this, but that's where it gets pretty murky from a legal standpoint.
However, ''developers'' of emulators must take extra precaution when working with code from a non-commercial emulator. As it is by definition not free software, the code is incompatible with the GPL, and the developer must take care not to mix GPL and non-commercial code. One example where this becomes relevant is with forks of old versions of MAME prior to its re-licensing to open-source. These forks can incorporate BSD code from the newest MAME versions, but are forbidden from including GPL MAME code. It has also been argued by some that RetroArch's ability to auto-download non-commercial cores is a license violation, as RetroArch is GPL-licensed and makes profit via Patreon.
===Open-core software===
