A three-judge appeals panel ruled Monday that about 100 digital billboards in Los Angeles installed by CBS Outdoor and Clear Channel Communications must be removed, according to a report in the Los Angeles Times.

The advertising companies should not have been allowed to convert their existing billboards to a digital format, according to the panel from the Second District Court of Appeal.

The billboards were installed as part of a 2006 legal settlement approved by the Los Angeles City Council. CBS and Clear Channel sued the city in an attempt to block a 2002 ordinance banning new billboards. The lawsuit’s settlement allowed the companies to convert their billboards to an electronic format.

Clear Channel Outdoor spokesman Jim Cullinan said that the company was reviewing its legal options.

“While this legal process continues to move forward, Clear Channel Outdoor remains focused on delivering great advertising solutions for our customers and working with the city and community of Los Angeles,” Cullinan said in a statement.