Locking a document in DEVONthink does not prevent changes to the metadata of the document, including adding tags, Spotlight Comments text, or Name change.
A common use of locking is to prevent inadvertent changes to content, especially in cases such that information would be lost, e.g., by editing a Nisus Writer RTF file using the built-in DEVONthink text editor.
The Lock action in DEVONthink does not lock the document against an external editor. For example, an RTF document that has been locked can still be opened and modified using “Open With” and choosing the parent application, e.g., Nisus Writer.
I use a couple of applications that create “hybrid” PDF documents, editable lunder their parent application, but viewed in DEVONthink (and other applications as wwll) as PDF. Were I to edit such a hybrid PDF within DEVONthink or Preview, it would not longer be editable under the parent applicaation. I “lock” such files. It’s a good idea to append to the name a reminder to myself of its proper parent application, wheich I can still do by a Name change even after locking it. The purpose of locking, of course, is to prevent inadvertent editing under DEVONthink, Preview, Acrobat, etc.
By design, the Lock action in DEVONthink is not identical to the Lock action in the Finder, which would entirely prevent modifying or renaming a file.
A number of users employ document naming systems that provide information to them, and they are free to modify the name of a document stored in a DEVONthink database, whether or not the document is locked. For example, I might create a rich text note that includes the name of a reference that it annotates, and append to the name whenever I wish, “locked” or not, other information, e.g., a textual “cue” string that could be used in a Lookup search to designate a scrolling position of a document in the result list view of the referenced document – a little trick that I often find useful.
Or I might add a YYYYMMDD “date” string as a prefix to a set of document names in order to make that set sortable by “date” in a Name sort. This will work whether or not any of the documents are “locked”. I might use that trick for receipts, publication dates, historical records or a variety of other purposes.
In sum, many DEVONthink users would resist an extension of the “lock” metaphor in DEVONthink to preclude Name change of a “locked” document.