If it is for the Government of Cuba then yes. However, individuals can utilize the software.

This is the Bureau of Industry and Security website

This is the law itself

Why even allow access to the internet? When you can talk directly to God on the OS

This Post was made by the TempleOS Gang

I mean I’m pretty sure this is exactly why trucks over a certain tonnage require and additional license to operate. At least here in the US they do. I’m sure many other countries have something similar.