Institute for
European and International Law

Research focus Team Prof. Polzin

The research focus of Prof. Polzins' team in particular lies on the following areas:

Public International Law, in particular: Treaty Law, Interpretation and Human Rights
Constitutional Identity
The Relationship between Public International Law, European Law und National Law
Constitutional Amendments and Constituent Power
European Economic Law

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Name	Purpose	Lifetime	Provider
test_cookie	Is set as a test to check whether the browser allows cookies to be set. Does not contain any identification features.	15 minute	Google
IDE	Contains a randomly generated user ID. Using this ID, Google can recognize the user across different websites across domains and display personalized advertising.	1 year	Google
_gcl_au	Contains a randomly generated user ID.	90 day	Google
_gcl_aw	This cookie is set when a user clicks on a Google ad on the website. It contains information about which ad was clicked.	90 day	Google
xs	Used to maintain a Facebook session. It works in combination with the c_user cookie to authenticate the user's identity on Facebook.	1 year	Facebook
fr	Used to serve advertisements and measure and improve their relevance.	90 day	Facebook
m_pixel_ratio	Performance cookie used by Facebook with Facebook pixels.	session	Facebook
wd	Used for analysis purposes. Technical parameters are logged (e.g. aspect ratio and dimensions of the screen) so that Facebook apps can be displayed correctly.	7 day	Facebook
dpr	Used for analysis purposes. Technical parameters are logged (e.g. aspect ratio and dimensions of the screen) so that Facebook apps can be displayed correctly.	7 day	Facebook
sb	Used to save browser details and Facebook account security information.	2 year	Facebook
dbln	Used to save browser details and Facebook account security information.	2 year	Facebook
spin	Cookie for advertising purposes and reporting on social campaigns.	session	Facebook
presence	Contains the "Chat" status of a logged in user.	1 month	Facebook
x-referer	Performance cookie that is used by Facebook in combination with Facebook pixels.	session	Facebook
cppo	Cookie for statistical purposes.	90 day	Facebook
datr	Identifies the browser for security and website integrity purposes, including account recovery and identification of potentially compromised accounts.	2 year	Facebook
locale	Saves language settings.	session	Facebook
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UserMatchHistory	This cookie is used to synchronize the LinkedIn Ads IDs.	30 day	LinkedIn
AnalyticsSyncHistory	This cookie saves the time at which the user was synchronized with the "lms_analytics" cookie.	30 day	LinkedIn
li_oatml	This cookie is used to identify LinkedIn members outside of LinkedIn for advertising and analysis purposes.	30 day	LinkedIn
lms_ads	This cookie is used to identify LinkedIn members outside of LinkedIn.	30 day	LinkedIn
lms_analytics	This cookie is used to identify LinkedIn members for analysis purposes.	30 day	LinkedIn
li_fat_id	This cookie is an indirect member identification that is used for conversion tracking, retargeting and analysis.	30 day	LinkedIn
li_sugr	This cookie is used to determine probabilistic matches of the identity of a user.	90 day	LinkedIn
U	This cookie identifies the user’s browser.	3 month	LinkedIn
_guid	This cookie is used to identify a LinkedIn member for advertising via Google Ads.	90 day	LinkedIn
BizographicsOptOut	This cookie is used to determine the rejection status for tracking by third-party providers.	10 year	LinkedIn
lidc	This cookie makes it easier to select LinkedIn's data center.	24 hours	LinkedIn
aam_uuid	This cookie is used for ID synchronization with Adobe Audience Manager.	30 days	LinkedIn
AMCV_XXX_at_AdobeOrg	This cookie contains a unique identifier for the Adobe Experience Cloud.	180 days	LinkedIn
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lang	This cookie stores the language settings of a user. This ensures that the LinkedIn.com website appears in the language selected by the user.	session	LinkedIn
twll	This cookie is set when Twitter is embedded on the page. Twitter collects data that is mainly used for tracking and targeting.	4 year	Twitter
secure_session	This cookie is set when Twitter is embedded on the page. E.g. Twitter's like or sharing functions.	14 year	Twitter
guest_id	This cookie is set by Twitter when a visitor shares content from the WU website on Twitter.	2 year	Twitter
personalization_id	This cookie is set by Twitter to measure the performance of Twitter advertising campaigns in a user's browsers and devices	2 year	Twitter
remember_checked	This cookie is set by when Twitter is embedded on the page. Twitter collects data that is mainly used for tracking and targeting.	4 year	Twitter
remember_checked_on	This cookie is set when Twitter is embedded on the page. E.g. Twitter's like or sharing functions.	4 year	Twitter
mbox	This cookie is intended for identifying Twitter users, for analyzing interaction with the Twitter Service and advertising whitin the service.	2 years	Twitter
guest_id_ads	This cookie is set due to Twitter integration and for sharing content to social media.	10 months	Twitter
d_prefs	This cookie ist used to check referral links and the login status.	90 days	Twitter
ct0	This cookie is set due to Twitter integration and sharing capabilities for the social media.	10 months	Twitter
kdt	This cookie is used to monitor the users login status on Twitter.	10 months	Twitter
guest_id_marketing	This cookie is set for tracking and analytics purposes.	10 months	Twitter
twid	This cookie checks if you are logged in to Twitter during a browser session.	1 year	Twitter
auth_token	This cookie is required for authentication and checks whether the user is logged in.	10 months	Twitter
external_referer	This cookie collects statistical data, including how often you visit Twitter and how long a user stays on Twitter.	1 day	Twitter
NID	This cookie contains a unique ID that is used to save user-specific settings and other information, in particular your preferred language, how many search results should be displayed per page and whether the Google SafeSearch filter should be activated.	6 month	YouTube
1P_JAR	This Google cookie is used to optimize advertising, to provide ads that are relevant to users, to improve reports on campaign performance or to prevent a user from seeing the same ads multiple times.	1 month	YouTube
CONSENT	This cookie is used to support Google's advertising services.	20 year	YouTube
OTZ	Aggregated analysis of website visitors.	17 day	YouTube