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I use CC to work files on different computers, so I'm the master of disaster. Customers have normally only read access to my files if any... Your case is different, but I thought that Indesign handles file locking on it's own and does not use the OS for that.
A simple on the fly ad-hoc possibility would be to rename the file like "ImportantJob.myname.indd". So by convention write access is prohibited when the "locking" is in place.
ABAMBO | Hard- and Software Engineer | Photographer