To Check Out a File
You can edit a
file associated with a document. When you check out a file, the document is
locked. A file can be checked out providing that you have the appropriate
permission, and the document approval status is
Not Approved.
Checking out a file prevents others from accessing the file until it is checked back in again.
You can also revert a checked-out file to checked-in status, via the Cancel Check Out option.