# Subscriptions

Rucio Subscriptions exist for the purpose of making data placement decisions before the actual data has been created. Subscriptions generate rules for new datasets based on matching metadata at registration time. Subscriptions are owned by an account and can only generate rules for that account. Policies may have a lifetime, after which they will expire.

An example of a subscription is given below:

Attribute | Value
--- | ---
Owner | tzero
match | project=data11 7TeV, dataType=RAW, stream=physics*
rule | 1@CERNTAPE, 1@T1TAPE
lifetime | 2012-01-01 00:00