Bump for this! i have the .wvm file and a key to go along with it.
http://ais.channel4.com/asset/3935639?client=android
<videoProfiles>
<videoProfile name="widevine-download-1">
<stream bitrate="0" filesize="536590783">
<uri>
http://ak.dl.c4assets.com/widevine-d...001001_001.wvm
</uri>
<token>
H5/p+FFBwixvYjxLQCOA0LIjdnOr8xgblVb/hMouf7vSs0ruoWXtST+XBuZojz1py5RlOB4oBTsdTQpZKu+DPu wk5T6SUoY751Kj/sibcc1hkPogCywRbCDa7s3o1vbygF1Takix8ud8hBJWT4DXF22 DEXBERzQrxtkgEwxKlAD0Qcdb0+3iMzG/06u8lvghjkSjoi6vsaNQRp7Upfp5ww==
</token>
</stream>
<cdn>ak</cdn>
<cdnFullName>AKAMAI</cdnFullName>
</videoProfile>
</videoProfiles>