This is usually an issue on the books you buy, not on the reader. I use my Sony PRS-505 only with content that I have loaded from my NAS, via memory card. I never installed the Sony software that came with it. (I can do without "$50" in "Free" public domain books.) I have never opened a .LRF file on my PRS-505. It's an almost decent b/w PDF/LIT/PNG/GIF/JPG reader with a built in AAC/MP3 player.
This is similar to the way that I have a PC with a DVD drive, but I refuse to play copy-protected (CSS) movies on it. I stick with data disks that sometimes contain movie files (e.g., AVI, MOV, & MPEG.)
DRMed works are exactly what you described earlier - guaranteed to be obsolete. The sellers of DRMed works bribed CONgress into letting them sell deliberately defective products. Some people are fooled into buying them, and some of us are not.
Of course, there's also the issue of readers like the Sony Libre, which was so crippled by DRM-like garbage, that it was unusable. Such devices must be appraised for their ability to operate in a free-world environment (i.e., Linux with no Sony s/w on the machine.) The Libre was less usable as a book than a rock (people have carved words into stone, but I have not seen a Sony Libre with words carved into its' carcus, yet.)
Andy
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