Legal issues?
QuoteDTS is a series of multichannel audio technologies owned by DTS, Inc.
QuoteFor PC playback, many software players support the decoding of DTS. The VideoLAN project has created a decoding module for DTS called libdca (formerly libdts), which is the first open source implementation of DTS.
source: DTS (http://en.wikipedia.org/wiki/DTS_(sound_system))
QuoteProvisional Warning: DTS Inc. claims that use of libdca software, to decode DTS compressed sound data on a DVD could violate DTS's patent rights. If you are unsure about the legality of using and distributing this code in your country, in particular in the USA, please consult your lawyer before downloading it.
source: Videolan: libdca - a free DTS Coherent Acoustics decoder (http://www.videolan.org/developers/libdca.html)
This is only for decoding part, the encoding is even more clouded.
I don't know if there is a work around? You could try audacity: dump video on it. If you're lucky you find all tracks there and can export these. Never tried or done it for DTS.
extracting audio track: source video working, audio track problem? (http://www.avidemux.org/smf/index.php?topic=10085.0)