At least Canon’s software (DPP) works just like you described, dust removal data are saved in metadata and usable only with (the same version of) Canon’s program.
Edit: Same thing with Lightroom (5.7) and exported DNG.
At least Canon’s software (DPP) works just like you described, dust removal data are saved in metadata and usable only with (the same version of) Canon’s program.
Edit: Same thing with Lightroom (5.7) and exported DNG.