Signature Systems Inc. , the point-of-sale vendor blamed for a credit and debit card breach involving some 216 Jimmy John’s sandwich shop locations, now says the breach also may have jeopardized customer card numbers at nearly 100 other independent restaurants across the country that use its products. Earlier this week, Champaign, Ill.-based Jimmy John’s confirmed suspicions first raised by this author on July 31, 2014 : That hackers had installed card-stealing malware on cash registers at some of its store locations
