Original sentence: COPA required all commercial distributors of "material harmful to minors" to restrict their sites from access by minors.The Department of Justice issued a subpoena to Google to obtain Web addresses and records of Google searches as one part of a study to provide evidence to uphold the COPA in its appeal.The law was part of a series of efforts by US lawmakers legislating over internet pornography
Edited sentence: COPA required all commercial distributors of "material harmful to minors" to protect their sites from access by minors.The Department of Justice issued a subpoena to Google to obtain Web addresses and records of Google searches to uphold the COPA in its appeal.The law was part of the struggle of US lawmakers against the proliferation of internet pornography