Playback window and License caching trouble

Hi,
we have a Flash Access 2.0 DRM license server built using the reference design. We have a working setup with a default policy where the License Caching is disabled and unlimited playback window and we're now trying to add new functionality to enable offline viewing. We have however run into some problems.
We have set License caching duration to 7 days and Playback window to 24 hours. This seems to work ok for a while but on some computers we have seen the following behaviour:
The user has several videos downloaded, some where the 7 days license caching has expired and some where both the playback window and the license caching are still valid. When the user download yet another video ALL the previous videos get the same license expiration date as the last one and the play window seems to be extended to the full license caching period of 7 days.
We have seen this behaviour on both Windows 7 and Vista but not on XP so far.
Do you have any idea what could be causing this behaviour?
Best regards
Jonas Hagberg

It is fine to use the same policy for multiple pieces of content.  Typically, a content publisher will have a small number of policies, and use those policies for their entire content library. As Xuan Liu mentioned, if multiple pieces of content share the same license ID, then a single license will be used to protect all of the content. If, in fact, the user has some licenses that have expired and some that are still valid, then it doesn't look like all the content is sharing the same license.
Do you have license chaining enabled? With license chaining, each piece of content has a leaf license, which can specify the license expiration. Leaf licenses are associated with a root license, and the root license can extend the expiration date for all leaf licenses associated with the root. License chaining is enabled through the policy.
Jonas Hagberg wrote:
 The user has several videos downloaded, some where the 7 days license caching has expired and some where both the playback window and the license caching are still valid. When the user download yet another video ALL the previous videos get the same license expiration date as the last one and the play window seems to be extended to the full license caching period of 7 days.
How did you determine that the expiration has been extended for all the existing videos? If you are not using license chaining, I suspect that when you go back to an older video, since the license has expired, it is actually requesting a new license from the license server (you should be able to verify this by looking at your license server logs). Since your policy says the license can be cached for 7 days, the new license is valid for 7 days from when it is issued.  However, if the 24 hour playback window has already been used, it would not be extended.  Playback window can only be used one time for each piece of content. If the playback window had already been used before the license caching period elasped, you would not get another 24 hour playback window when you get a new license on that machine for the same content.

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