Although another developer created the Steam version from scratch, I helped with design and feedback during a handoff period (which means the Steam version contains a lot of content that is new to it)
As part of the deal we came to an agreement at the time that both of us are still very happy with.
Thank you for answering! I feel much better about buying and recommending the Steam version now.
While we're on the topic of permissions, I'm planning a conference talk doing some design analysis of the game (among others). However, you might want to talk about it yourself, in which case I can work with you. Let me know if you're interested.