According to the license terms of my DVD's (software, not video), I am allowed to make a copy for backup purposes.
Disk utility seems to have no problem making images (DVD / CD master option), for discs from 90's. But for disks in the early 2000's, it seems to fail with error code 5.
I have googled extensively what "error code 5" is, and there seems to be no answer on the inter web what error code 5 is. I can only guess that this error seems to have something to do with these particular DVD's produced in early 2000's. The disks themselves are scratch free, and work fine (they are practically unused). If this means the disks are DRM'd, then how am I supposed to make a backup ?