How to return the write permissions of the cryptocontainer?

Question

macOS

Today I discovered that write permissions have disappeared in the cryptocontainer located on a removable disk, I can only copy from it.
The properties say "read only"
Tried to change through "sudo chown" did not help.
The cryptocontainer is made with the help of TRUECRYPT
I ask for help from those who know.
OS: OS X YOSEMITE 10.10.5