> For the complete documentation index, see [llms.txt](https://docs.fp.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.fp.io/features/nft-fractionalization/safebox/safebox-keys.md).
# Safebox Keys
Safebox Keys serve as unique identifiers and grant holders exclusive access to Safeboxes anywhere from 3 days to an indefinite amount of time.
**Identification:** Each Safebox is assigned a distinct Key when created, providing access and control over that specific Safebox.
* **Exclusive Access Privilege**: The Safebox Key enables the holder sole ability to unlock and redeem the NFT inside until expiration. No one else can access the contents during this period.
* **Facilitating Ownership Transfers**: Keys allow the holder to transfer ownership during auctions. The recipient becomes the new owner.
* **Extending Access Duration**: Holders can lengthen the period of access by staking the required $FLC token fee to extend the key's expiration date.
{% hint style="info" %}
While Safebox Keys can exist indefinitely they must be renewed before their expirations.
{% endhint %}
Safebox Keys provide exclusive temporary access to the NFTs locked within the Safebox by the holder. They uniquely identify each Safebox while facilitating ownership transfers through featured auctions.
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