Like Bob has said, any gold CD (MFSL, DCC, etc) can be copied either to another CD or to your iPod or hard drive.
An SACD layer cannot be copied, but can be "re-recorded" onto your hard drive as 6 wav files if you have the right equipment. However, you would then have to do something with these 6 files to create another disc, and it would NOT be an SACD. DTS, DD, or DVD-A would work.
The DVD-A HiRez layer is the most copy protected music format ever made. The watermark technology, AFAIK, has never been hacked. You can access the DD or DTS tracks as in any DVD-V, but no matter what anyone says, you cannot copy or re-record the HiRez DVD-Audio tracks and then create another DVD-Audio disc if the source disc is watermarked.
I've always thought that it was ironic that the most secure copy protection is on a format that no one ended up caring about at all! Too funny.