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License question for commercial

Dear Sir,

Feel Sorry, If we want to use some module for commercial develop, and to do some change in our environment,
Do we need pay for license requirement ?

If yes, do we need to pay an annual license fee ?
and how much we need to pay ?
and it have the domain limitation ?

Millions Thanks
Andy

Mattermost Team Edition is an open source, private cloud alternative to proprietary SaaS for team messaging. No license fees or payments are needed. Here is a summary of open source licenses used across the system.

Mattermost Enterprise Edition is a commercial, private cloud enterprise messaging solution and commercial licenses can be purchased online.