To my knowledge, the source to the 1.3.x release isn't public. I wonder whether it's a complete rewrite from scratch or whether 1.3.x still contains patches from external contributors and whether they agreed that their work be sold for money.
Your knowledge is incorrect. The 1.3.0 source is available[0], and 1.3.1 should be soon[1], they have not dumped them in the public repository is all.
> I wonder whether it's a complete rewrite from scratch or whether 1.3.x still contains patches from external contributors and whether they agreed that their work be sold for money.
I'm not sure that has any relevance. It would if Growl had changed its license (they have to agree to license changes to their contributions, unless they ceded their copyright to the project or project owner), but selling the product is independent of that. It can be seen as a dick move, but it's still independent.
BSD is irrelevant here. If it was a GPLv3 licenced work it could still be sold. The agreeded to their work begin sellable when they contributed to an open source project.
That is correct. The only difference a GPL license would make is that Growl would be forced to release the source code for any version that they sell. And that they wouldn't be able to sell it through the App Store.
