> For the complete documentation index, see [llms.txt](https://docs.capsulelabs.xyz/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.capsulelabs.xyz/capsulenft/overview/capsule-collections/lockability.md).

# Lockability

Locking a collection sets a permanent limit - determined by the Collection Owner - to the amount of NFTs that can be minted in a Capsule Collection. Once the limit about has been reached, no one, including the owner, can mint any more NFTs in the collection (*see Example #1*).

After creation, a collection may be locked at any time by calling the *lock* method and passing in a numerical upper bound. Please note that the Owner can only pass a numerical upper bound that is greater or equal to the current NFT count (*see Example #2*). Both private and public collections can be locked at any point by the owner of the contract - *but never unlocked*.

To permanently prevent a collection from being locked, please use of the following methods:

* Set the lock number to the maximum unit 256 minus one (2^256 - 2)
* Transfer ownership of the unlocked collection to the 000 address

{% hint style="warning" %}
During Beta, Capsule Collections *can only be locked from the backend*. To view the developer walkthrough, please read [Developer - Managing a Capsule Collection](/capsulenft/developer-walkthroughs/developer-managing-a-capsule-collection.md).

The Capsule team is working towards improving this feature for the future. 
{% endhint %}