Email marketing vendor Epsilon said late last week that it detected a security breach March 30 that compromised the names and email information of several clients' customer databases. Impacted companies include JPMorgan Chase & Co., Walgreens, Best Buy, Ameriprise Financial and TiVo, according to media reports. Epsilon said April 6 that the breach affected about 2% of its total client base, and that no personal identifiable information, such as Social Security numbers, credit card numbers or account information, was accessed.