I asked the same question in one of the previous threads. Was told that most likely Flash player includes too much licensed third-party code that it would be too much work, if at all possible, to strip it out or relicense it for open-sourcing.

At least all the relevant specifications are freely available from Adobe themselves.

> I wish there were a law to ensure that if you're not selling a software anymore, you have to leave it in public domain.

Shortening the copyright to something sensible like 5 years would've been nice too. Or better yet, require an exponentially increasing tax every year for copyright to be maintained.