The upcoming release of Flash Player 10 will include some changes that may require existing content to be updated to comply with stricter security rules. You will want review the upcoming security changes in Flash Player 10 to determine whether you need to modify existing content to ensure compatibility. Read about them at:
A practical guide to working with policy file changes in Flash Player 9 and Flash Player 10 beta is available to assist your customers with changes to the core of the permission system. Get that at:
If you are impacted, you can download the release candidate beta of Flash Player 10 to begin testing their content changes. It is not necessary to be in the pre-release program.