Can't burn some aiff files (not purchased) to CD
I have a set of files from a live recording made 25 years ago. No copyright, not purchased. Computer has been "authorized" (whatever that means). Can't burn to CD. Error message for 12 of 14 files: "Some of the files cannot be burned". The only suggestion made has to do with authorizing, which has been done (twice).
MacBook Pro 13″, macOS 12.7