I'm having problems with forward-lock protected audio and video files on a Nokia E61. The files can be downloaded and saved without problems, but when trying to open the file, the message "no activation key" is being displayed.

When downloading JPEG images (also forward lock protected) they can be opened without problems. The only difference is the content-type specified in the DCF file (and the binary content, of course).

These are they HTTP headers when downloading the file. Looks correct to me, the content-type is "application/vnd.oma.drm.message":

HTTP/1.1 200 OK
Date: Mon, 26 Nov 2007 13:35:43 GMT
Server: Apache
Content-Length: 96061
Content-Disposition: attachment; filename=HalloAbheben.mp3
Cache-Control: private,max-age=3600,no-transform
Keep-Alive: timeout=15, max=100
Connection: Keep-Alive
Content-Type: application/vnd.oma.drm.message

This is from the audio file downloaded:

Content-type: audio/mpeg
Content-Transfer-Encoding: binary

The only difference when downloading an image is that the content type is specified as "image/jpeg".

I have read in other threads that there are issues with some S60 3rd Edition devices and Forward Lock. But then it is working with images. Would be great if anybody can give me a hint.