You are very likely running into a "one play" license. FairUse4WM only works if you have a license and doesn't have the ability (... yet ... ) to ask the
servers for a new license.

The solution to this is let FairUse4WM use the license instead of Media Player by acquiring but not playing the file.

• Set your media player to ALWAYS PROMPT before acquiring a license. You should have this as your common setting anyway, because it will save you from folks using the DRM URL to deliver IE Exploits.

• Open the file in Media Player and acquire the license, but DON'T click play

• While the dialog is open you should be able to use FairUse4WM on that file. You can also exit Media Player (Click close) and collect licenses for
  multiple files.

A future version of FairUse4WM will probably include code to request the licenses from the server -- especially if anyone happens to be handy with
Wireshark and a debugger (The IBX encrypts part of the string with the server's public key - you'd need to "fix" that or otherwise extract the temporary key it creates).