I don't own one of these, but have been researching it as a possible purchase.
I believe that you can copy the files off of the Humax (Foxsat HDR?) onto a memory stick in VIDEO_TS format.
You'd then need to convert this via an Application like Handbrake. I don't have any more specific information other than to say that you could have a dig around in both of this forums:
http://www.avforums.com/forums/freesat/964001-humax-foxsat-hdr-freesat-owners-th read-part2.html
or
http://forum.handbrake.fr/
Obviously it goes without saying that you will only be reproducing material that isn't copy-protected and / or under copyright restrictions. Discussing circumvention of copy-protection is prohibited on these forums, so I can not offer further information lest it be used to wilfully copy your own DVDs.