U could play ur Humax into a dvd recorder via scart in realtime and record ur content...
...But I assume u mean take the programs recorded on ur Humax (m2ts format) and burn to a dvd. Yes u can do this fairly easily. The only problem is finding a program on ur pc that will let u edit the files (to remove adverts and top/tail ur files)
Google "burn m2ts files dvd" and u should get some help. or
google "copy humax freesat dvd"