How can I unlock a Spec?

Specsources locks the Specs while they are being edited by a Designer / User.

If locked the Spec cannot be edited while another Designer / User is working on it.

If a Spec remains locked, even if the Designer / User who was working on it has logged off, then what needs to be done is:
Go in the Spec Schedule, click on the checkbox of the locked item, then click on the unlock button in the top menu in black. This will unlock the Spec.