The SDK license permits any kind of license for your plugin. If you are the original author, then you are free to release your plugin under any license you wish, including commercial licensing. However, if you are not the sole author of the project, then you need to carefully check what the licesning requirements are of the code, artwork, and names you used.

For example, if you used code that was licensed with a GPL license, then it's likely you will need to release your plugin under the same GPL license. Other types of licenses might make requirements about "derivative works", which your plugin may be considered if you ported. It's your responsibility to carefully and completely check your work is in compliance. This is a legal matter and should be taken seriously.

Permissions

Contact the original author

In addition to adhering to legal requirements of licensing, if your plugin is largely based on another work (i.e. you ported a VCV Rack or VST plugin to MetaModule), then you should contact the original author and ask for permission to port their work to the MetaModule. Not only is this polite, but you also may find out someone else is working on a port, or that the author wishes to help, or perhaps the author would not be happy to see their work running on another platform. Other times, you may be asked to put a disclaimer that the plugin is not official and all bug reports should go to you (instead of to the author of the original plugin). In any case, even if there is not always a strict legal requirement to contact the original author, it's in the interest of everyone involved and in the general spirit of sharing to be in communication with the original author before porting.

Consider other aspects besides the source code

Keep in mind, there may be different licenses and permissions for various aspects of the project. For instance, some projects may have different requirements for you to use:

• Source code
• The plugin or brand name
• The artwork

Make sure you have permission to use all portions of the original work that you used. If anything is unclear, contact the original author and ask. You may need to change the name or create your own artwork from scratch. Feel free to reach out for help on the metamodule forum if you are stuck or don't know what to do.