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A developer of smartphone applications has sued Google for $2 million in federal court in Newark, accusing the Internet giant of aiding producers of copycat products who infringe the trademark of the plaintiff’s popular Spy Phone app.

Spy Phone Labs of Wayne, N.J., claims in its complaint that its app was downloaded more than 1.1 million times in its first year on the Google Play marketplace, where most smartphone apps for the Android operating system are sold. But downloads plummeted to 260,000 in the second year, after Spy Phones complained to Google about trademark infringement by competing products and the app maker was twice suspended from Google Play, the suit claims.