Well, thank you for asking. I guess I can understand. If the format weren't proprietary, there would be no imperative to buy or use the iRealPro app, as others may develop competing apps that could read it... The extensive library that has built up around iRealb would be nice to tap into...
I'm wanting to see if it would be possible to open the existing iRealb/Pro forum library of tune files in another program, that I would develop... I could only find reference to the "legacy" .irb format, which apparently is not how charts are currently saved. Can they be opened in a code or...