The Library of Congress, which oversees the U.S. Copyright Office, has published new rules to replace a set of controversial — and for many, outdated — measures. Consumers now may hack their own tablet computers, automobile software and Blu-ray devices without fear of being sued. The ruling upgrades certain provisions of the Digital Millennium Copyright Act, which is designed to protect against the theft of intellectual property. The new provisions allow users to make common sense changes to their devices to switch carriers, for example.