Making a readonly mac .dmg file writable

Targets macOS
1

Hello,

I was trying to convert a read-only .dmg to read/write with Apple’s Disk Utility, but after the conversion was done it still opened as a Read-only archive.

Then I tried this…
hdiutil convert nameoffile.dmg -format UDRW -o nameoffile_writable.dmg
in terminal, and it still opens as a read-only.

What am I doing wrong?

Thanks.

Lennox

2

untested
I believed converting a read-only to a read-write created a new copy of the disk image that was read-write.