More than 60 lawsuits have been filed in the past two months against major retailers and restaurants for failing to comply with a new provision governing credit card transactions.

The suits, filed in California, allege that the companies violated a provision of the federal Fair and Accurate Credit Transactions Act that forbids cash register receipts from displaying the expiration date or more than the last five digits of a customer’s credit card number. The provision became effective on Dec. 4, 2006.