I assume you want them decrypted so that they can be played on your PC.
You have many options - as a trawl through this discussion db will show you.
If you pull it off via DLNA then it decrypts on the fly.
If you want to use, say, FTP you need to decrypt first on the humax itself.
The Custom Firmware has a number of decryption options which allow one off/as and when decryption, or regular background decryption.
On the basis that I don't want to transfer the majority of the recordings I use the DLNA approach (or external disk copy for multiple recordings).
Before I suggest a method, which I'm sure several other members will challenge with better alternatives, can you tell me why you need an alternative to the one you re currently using based on the Samsung software, it sound fine to me.
By the way I find that transferring via DLNA is faster than one off decryption on humax plus FTP. The humax is not especially fast at decrypting a file "in place".