Open a file in a tab in vim in readonly mode

Question

I\'m aware of opening files in readonly mode from shell using vim -R, but how to open a file from inside vim in a separate tab (:tabe )

Answer 1

vim -R /path/to/file
vim -m /path/to/file

Read-only mode. Modification in text is allowed but you cannot write (no saving).

vim -M /path/to/file

Even modification in text is not allowed.