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+---
+layout: page_v2
+page_type: module
+title: Module - Storage Control
+description: Check or enforce disclosure of device storage use
+module_code : storageControl
+display_name : storageControl
+enable_download : true
+recommended: true
+sidebarType : 1
+min_js_version: 10.0.0
+---
+
+# Storage Control Module
+
+This module checks other modules' use of device storage against their disclosed list of storage keys and warns about or (optionally) denies undisclosed storage use.
+Additionally, it provides an API to list all disclosed storage keys.
+
+## Background
+
+The TCF Global Vendor List (GVL) requires vendors to disclose their use of device storage by publishing a [JSON file](https://github.com/InteractiveAdvertisingBureau/GDPR-Transparency-and-Consent-Framework/blob/master/TCFv2/Vendor%20Device%20Storage%20%26%20Operational%20Disclosures.md) that lists all the identifiers (cookie names and/or localStorage keys) and their associated domains.
+The Storage Control module uses that information to validate that when a Prebid module accesses storage, it uses identifiers that have been disclosed as in use for first party domains. 
+Vendors not in the GVL can provide a disclosure JSON to Prebid directly - see [adapter integration](#adapter-integration) below. 
+
+## Publisher Integration
+
+Include this module in the Prebid bundle:
+
+   ```bash
+   gulp build --modules=storageControl,...
+   ```
+
+If you are instead using Prebid as an NPM dependency, you'll need to explicitly import disclosure metadata. 
+This is done by including `metadata/prebid-core` and pairing each module import with a corresponding `import 'prebid.js/metadata/<module>'`. For example:
+
+```javascript
+import {pbjs} from 'prebid.js';
+import 'prebid.js/modules/userId';
+import 'prebid.js/modules/sharedIdSystem';
+
+import 'prebid.js/metadata/prebid-core';
+import 'prebid.js/metadata/userId';
+import 'prebid.js/metadata/sharedIdSystem';
+
+// ...
+```
+
+### Module Configuration
+
+This module exposes a single configuration option `storageControl.enforcement`, e.g.:
+
+```javascript
+pbjs.setConfig({
+  storageControl: {
+    enforcement: 'off'
+  }
+})
+```
+
+Possible values for it are:
+
+{: .table .table-bordered .table-striped }
+|Value | Description |
+| ------------ | ------------ |
+|`'off''` | The default. Use of undisclosed storage keys only generates a console warning. |
+|`'strict'` | Deny access to undisclosed storage keys |
+|`'allowAliases'` | Deny access to undisclosed storage keys, unless the use is from an alias of a module that does disclose them, in which case only log a warning. This can happen for instance when a bidder provides an alias linked to a different vendor in the GVL. |
+
+### Storage Disclosure Summary
+
+With this module included, the `getStorageUseDisclosures` API returns a list of all disclosures pertaining the first party domain for all installed modules. For example:
+
+```javascript
+pbjs.getStorageUseDisclosures()
+
+/**
+    [
+      {
+        "disclosedIn": "https://cdn.jsdelivr.net/gh/prebid/Prebid.js/metadata/disclosures/prebid/sharedId-optout.json",
+        "disclosedBy": [
+          "sharedIdSystem"
+        ],
+        "identifier": "_pubcid_optout",
+        "type": "cookie",
+        "maxAgeSeconds": 31536000,
+        "cookieRefresh": false,
+        "purposes": []
+      },
+      ...
+    ]
+ */
+```
+
+The return value follows the same format as the TCF [disclosures array](https://github.com/InteractiveAdvertisingBureau/GDPR-Transparency-and-Consent-Framework/blob/master/TCFv2/Vendor%20Device%20Storage%20%26%20Operational%20Disclosures.md), except that 
+
+- `domain`/`domains` is omitted (and always `'*'` in the original disclosure, as Prebid's storage is always on the first party domain);
+- each item in the array contains these additional fields:
+
+{: .table .table-bordered .table-striped }
+|Name | Type | Description |
+| ------------ | ------------ | ------------ |
+|`disclosedIn` | String | URL of the JSON containing this disclosure. Can be `null` for identifiers chosen trough publisher configuration - such as those set by the [userId module](/dev-docs/modules/userId.html) |
+|`disclosedBy` | Array of Strings | Names of the Prebid modules providing this disclosure |
+
+<a id="adapter-integration"></a>
+
+## Adapter Integration
+
+Modules that use storage should publish a [disclosure file](https://github.com/InteractiveAdvertisingBureau/GDPR-Transparency-and-Consent-Framework/blob/master/TCFv2/Vendor%20Device%20Storage%20%26%20Operational%20Disclosures.md) listing all keys that the pass to `storageManager` for the first party domain (`'*'`). This can be done by either:
+
+- providing a GVL ID in your adapter. The corresponding `deviceStorageDisclosureUrl` from the GVL is then used as your disclosure.
+- providing a `disclosureURL` directly. This does not require membership in the GVL, and overrides its disclosure if provided. For example:
+
+```javascript
+registerBidder({
+  code: 'exampleBidder',
+  disclosureURL: 'https://exampleBidder.com/disclosures.json'
+})
+```
+
+## Related Reading
+
+- [Vendor Device Storage & Operational Disclosures](https://github.com/InteractiveAdvertisingBureau/GDPR-Transparency-and-Consent-Framework/blob/master/TCFv2/Vendor%20Device%20Storage%20%26%20Operational%20Disclosures.md)
+- [Consent string and vendor list formats](https://github.com/InteractiveAdvertisingBureau/GDPR-Transparency-and-Consent-Framework/blob/master/TCFv2/IAB%20Tech%20Lab%20-%20Consent%20string%20and%20vendor%20list%20formats%20v2.md)