Advertising-supported companies have long turned to the courts to squelch products that let consumers block or skip ads: it happened in the famous lawsuit against the VCR in 1979 and again with ReplayTV in 2001.

Tomorrow’s legal fight may be over Web browser add-ons that let people avoid advertisements. These add-ons are growing in functionality and popularity, which has led legal experts surveyed this week by CNET News.com to speculate about when the first lawsuit will be filed.

If ad-blockers become so common that they slice away at publishers’ revenues, “I absolutely would expect to see litigation in this area,” said John Palfrey, executive director of Harvard Law School’s Berkman Center for Internet and Society.

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