Claiming that modern vehicles are "too complex" for home mechanics to fix, automakers are seeking copyright restrictions to prevent gearheads from working on their own cars.

The Association of Global Automakers, a lobbying firm for 12 manufacturers, is asking the U.S. Copyright Office to prevent car owners from accessing "computer programs that control the functioning of a motorized land vehicle, including personal automobiles, commercial motor vehicles, and agricultural machinery, for purposes of lawful diagnosis and repair, or aftermarket personalization, modification, or other improvement."

"In order to modify automotive software for the purpose of 'diagnosis and repair, or aftermarket personalization, modification, or other improvement,' the modifier must use a substantial amount of the copyrighted software – copying the software is at issue after all, not wholly replacing it," the AGA claimed.