HT2321 - Proprietary RAW vs DNG

I'm not a fan of proprietary file formats. It seems to me that they have a way of putting our content at risk. I'm not comfortable with that. Instead, I use the open source DNG format for my working images in my Lightroom catalog. I do keep, however, all the original RAW camera files on backup hard drives just in case a future generation DNG converter adds features that I might find useful.