[tmcw]

Yes, that's the rationale. A customer has asked about getting access to the source ahead of time and I'll try to make that work.

[bdcravens]

As I mentioned in another comment, perhaps you could invite current users to a private repo, and then make it public at the business EOL.

[sneak]

If it’s open source, a private repo is not protection. Free software licenses allow for unlimited redistribution.

[TheGeminon]

You don’t need to apply the license until after the public release, before then it would just be sharing code with your customers under whatever agreement you want

[orblivion]

Given your setup would it be easy to make a data exporter/importer? That way you could give them the data and shut down before opening the source.

[tmcw]

Placemark was built around that idea - all the data is easily exportable & importable in many open formats. It should be straightforward to move to the open source version or other tools.