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Re:Tanker: End-to-End Encryption SDK for JavaScript by tux3 on Wednesday May 22, 2019 @12:50PM (#19983018)
There's a server component that's not on Tanker's Github, so commercial users probably can't start using the SDK without telling anyone.
Re:Tanker: End-to-End Encryption SDK for JavaScript by detaro on Wednesday May 22, 2019 @12:58PM (#19983098)
They can legally use the SDK under the open source terms without paying if they find a way of using it without Tanker's servers. For the server access, they need to pay, thus that's what they're selling.

In contrast Qt is selling licenses to the code, not access to a hosted service.