P: Ability to lock photos to prevent further editing

Oops, that plugin only protects against deletion, not the other kinds of changes you described.

See here for a plugin solution:
 https://feedback.photoshop.com/photoshop_family/topics/locking_photos_please_protect_me_from_myself?...

See here for a plugin solution:
 https://feedback.photoshop.com/photoshop_family/topics/locking_photos_please_protect_me_from_myself?...

The proposed LR feature is to allow us to Lock Image Sates to prevent unintended edits, and to allow Deliberate Unlocking of images to permit edits.

LR offers keystroke shortcuts to do complicated things, as most of us now enjoy, thereby risking that a few keystrokes can exert unintended, and unnoticed, edits on huge numbers of files. Aside from Shortcuts, even a delete key could wipe out, for example, Keyword fields that required great effort to create. Unintended edits can escape notice for prolonged periods, so simply reverting to a Catalog Backup is not a good solution. I speak from experience of noting my own errors, only months afterwards.

While it's natural that each of us is zealous about a feature that we most want, I'll argue that the ability to Lock Images represents an overdue Catalog safety feature.

John Caldwell

As a workaround, consider the PhotoSafe plugin.

Often clients want a few low res images immediately after the shoot (for social media, etc.) and I'll deliver these immediately. Then, later that week I will edit the whole job for final delivery as carefully culled and edited high res files. I live in fear that when I come back and edit I will cull from the final edit an image I've already shown to the client as a low res file. I would love a feature that allows me to lock an image from being deleted from the catalog (or marked x) or in any way changed. Something to make sure that image is protected in the exact state the client has already seen. Yes I could give it five stars or mark it a particular color, but ratings and colors are something that I could easily change during the culling process. I want something like a LOCK where you have to go and affirmatively UNLOCK before further changing anything about or moving the image.

Another vote for locking an image to protect it from deletion.  Sometimes I will provide a sneak peek to a client immediately after the shoot or maybe the client will look at the laptop and pick some favorites during the shoot and it's absolutely imperative that these shots don't get somehow edited out.  I would absolutely love some sort of tool that would prevent locked images from being moved and/or altered. This would be fabulous. As it is I do all sorts of things like apply colors and stars, but when I'm editing a job with thousands of images it's so easy to miss a label and delete something by mistake.

An idea for a Lightroom feature would be a switch that would lock an image from further editing in the Develop Module. I have PSDs and some TIFs that are archival. It would be nice to protect them from myself from further editing. 

Oh, I didn't mean to imply that LR doesn't need locking.  It definitely does. 
I was just sharing my workaround. 

i use all my color labels for other thing already.. and its not fool proof.