btw, the source code for Flash Player 4 is available on the Internet Archive. That was before my time at Macromedia, but I heard that Macromedia either open sourced the code (and then changed their mind for Flash Player 5 when they started charging for source code access) or it has been shared with a partner company who leaked it. Supposedly a few Korean electronics companies included this Flash Player 4 code in their devices when Macromedia was trying to sell Flash Lite (also a fork of Flash Player 4) as an solution for mobile phone UIs.

I know Adobe will never open source the final Flash Player code (because of third-party code licenses and there’s nothing for Adobe to gain), but I wish they had at least open sourced their internal test suite so open source players could improve their Flash compatibility.