Locknodes
Open Edit > Preferences > Add-ons > LockNodes and set a master password. It's stored only in your local Blender preferences, salted and hashed — never in a shipped .blend. Locking uses this password automatically; unlocking always requires typing it.
Select the locked group, open the LockNodes N-panel tab, enter the password and click Unlock. If the group has locked sub-groups nested inside it, Unlock All rebuilds every one of them in a single click.
A locked group shows a flat placeholder in its base color, optionally tiled with a watermark text of your choice (e.g. "Full version on SuperHive"). Both are set in the add-on preferences and apply to every group you lock afterward.
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compositor-nodes DRM geometry nodes watermark password protect preset pack shader nodes node security node lock node groups encryption blend file protection