DVD read CSS keys error

[Neo hong]

I used gstreamer plugins playing dvd and installed libdvdread-5.0.2 and
libreadcss-1.3.0

some errors happened:


>libdvdread :Attempting to retrieve all CSS keys;
>libdvdread: Get key for /VIDEO_TS/VTS_06_1.VOB at 0x000533ea
>libdvdread: Error cracking CSS key for /VIDEO_TS/VTS_06_1.VOB
(0x000533ea)!!
>libdvdread: Elapsed time 0
.
.
.
>ERROR: from element
/GstPlayBin:playbin0/GstURIDecodeBin:uridecodebin0/GstDvdReadSrc:source:
Could not read DVD.
   Additional debug info:
>dvdreadsrc.c(989): gst_dvd_read_src_create ():
/GstPlayBin:playbin0/GstURIDecodeBin:uridecodebin0/GstDvdReadSrc:source
>ERROR: pipeline doesn't want to prerol


Any reply is appreciated.
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