Are all lossless tracks of a movie the same?

[Clark Kent]

Originally Posted by Leterface

Is there any chance for consumers to know if the BD have a real lossless audio track or only lossy upconverted lossless audio?

Yes, if you rip the audio off the Blu-ray and perform spectral analysis. Both Dolby Digital and DTS in their lossy versions have specific frequencies where the musical content is rolled off above it. I know of no unified resource keeping track of this though, except for a few vague threads on other forums.