# License
After TrueConf MCU installation, you need to activate it with the registration key.
You can get a three-week trial, so you can try all the features and benefits of TrueConf MCU before purchasing it. Just contact us in any convenient way.
Please note that even the free version of TrueConf MCU does not have restrictions on the duration of conferences or the amount of time a participant can stay in a conference.
It the table below, you can see TrueConf MCU license comparison:
| License type | Free | Premium |
|---|---|---|
| Maximum number of concurrent conference participants | 100 | Up to 150 |
| Maximum number of concurrent conferences | 4 | Unlimited |
| “TrueConf MCU Free” watermark in the upper right corner of the screen during video conferences | Yes | No |
| Connection to the registration server (via 443 TCP port) | Required | Not required |