Why NowSMS adds .dm to FL content?

Why NowSMS adds .dm to FL content? SearchSearch
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Alex
Unregistered guest
Posted on Wednesday, May 17, 2006 - 02:45 pm:   

If compose an MMS with any content and use Forward Lock option from NowSMS web interface (I use 2006 edition)
A content file received with '.dm' added to its name (e.g. 'pig.jpg' file used and 'pic.jpg.dm' received).
As far as FL mechanism does not change the file and specified by
"Content-type: application/vnd.oma.drm.message"
option, file should not be changed.

Note: I downloaded file 'pic.jpg.dm' from mobile FS renamed it to 'pic.jpg' and viewed it OK, so file is not changed indeed - why extension added?