This is how the Delphi and Turbo Pascal 3rd party markets have worked for a long time: you pay for 3rd party components/libraries, but they almost all come with

This is how the Delphi and Turbo Pascal 3rd party markets have worked for a long time: you pay for 3rd party components/libraries, but they almost all come with source code or an option to purchase the source code for an additional charge. It works really, really well, especially for larger organizations that buy from smaller organizations that want to ensure the continued availability of the software and/or audit it for security purposes.