"The next version of Adobe Flash Player will offer a variety
of new features and enhancements as well as some changes to the current
behavior of Flash Player. Some of these changes may require existing content to
be updated to comply with stricter security rules. Other changes introduce new
abilities that were previously unavailable or restricted by security rules.
Please review the following security-related changes being
made to Flash Player 10 beta. Use this list to determine whether you will need
to make changes to your existing content for it to function correctly in the
next Flash Player release.
Changes that may require action
- Policy file strictness: Phase 2
- Socket connection timeout
- Upload and download require user interaction
New security-related features that are available
Article: http://www.adobe.com/devnet/flashplayer/articles/fplayer10_security_changes.html