Pipedia content is a mix of public domain and copyrighted materials used by permission. It is imperative that copyrighted material be used by permission only, and the use of that material be properly cited with the source indicated in the article. See | Pipedia content is a mix of public domain and copyrighted materials used by permission. It is imperative that copyrighted material be used by permission only, and the use of that material be properly cited with the source indicated in the article. See |