theodp writes "Thousands of teachers are using websites like Teachers Pay Teachers and We Are Teachers to cash in on a commodity they used to give away, selling lesson plans online for exercises as simple as M&M sorting and as sophisticated as Shakespeare. While some of this extra money is going to buy books and classroom supplies, the new teacher-entrepreneurs are also spending it on dinners out, mortgage payments, credit card bills, vacation travel and even home renovation, raising questions over who owns material developed for public school classrooms."
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