Ok, got my original .lit file.
Use convertlit to remove drm, but this then produces a html file.
Use libprs500 to convert html to lrf. - result - Diagrams missing.
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If i use lit2lrf, on the original .lit file, it tells me to use convertlit to remove the drm.
If i do this i no longer have a lit file, i have a html file...which lit2lrf doesn't recognise...