via wptavern.com => original post link
The advent of block themes delivers more creative power into the hands of users, but there are times when theme authors may want to lock down key elements of a design and its designated content areas. First introduced in Gutenberg 11.6, the upcoming WordPress 5.9 release will include a new API for locking blocks.
Template level locking has been available in Gutenberg for a few years, allowing developers to lock the template on the UI so that users can’t manipulate the blocks. This new API offers more granular control that can be applied on the block level and override template locking.
“Instead of applying a lock to all inner blocks, you can apply it selectively to individual blocks via the lock attribute,” Marcus Kazmierczak said in the dev note. “The block level locking would supersede the inherited templateLock value. You can choose to lock moving or removing a block.”