Tomboy Addin:Read Only Note
Sometime, you want to make certain notes to be read only. You don’t want to accidentally modify those precious notes. It’s sad to know that tomboy doesn’t have this functionality. Luckily, tomboy have addin support and with some C# knowledge you will be able to create it.
Digging the tomboy source reveal that it’s rather simple. You just need to set
Window.Editor.Editable = false;
So without further ado, I bring you this little addin. To use it, just download zip file below. Extract it and put the ReadOnly.dll to $HOME/.tomboy/addins. Restart your tomboy, then enable it through Preferences.

