> For the complete documentation index, see [llms.txt](https://docs.zerve.ai/guide/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.zerve.ai/guide/canvas-view/blocks-and-connections/block-level-security.md).

# Block level Security

You have an option to lock a block. Once blocked you will not be able to edit it and the only way to re-run it is by clicking on Force run as you can see in the video below.

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Lock a block
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Similarly, you can use the option to "Lock up to here" to lock all the blocks until the selected block. You can also use the option "Unlock up to here" to unlock all the blocks until the selected block.

<figure><img src="/files/RYO8z9Z8gjTFujO98AA3" alt=""><figcaption><p>Block Locking Options</p></figcaption></figure>