wyprodukowano bez wyzysku siły roboczej
wyprodukowano bez udziału taniej siły roboczej

wyprodukowano z poszanowaniem praw pracowników / bez łamania praw pracowników / bez naruszania praw pracowniczych

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Note added at 116 days (2016-06-19 07:16:01 GMT) Post-grading
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A "sweatshop" is defined by the US Department of Labor as a factory that violates 2 or more labor laws.

Sweatshops often have poor working conditions, unfair wages, unreasonable hours, child labor, and a lack of benefits for workers.
https://www.dosomething.org/us/facts/11-facts-about-sweatsho...

Sweatshops are work environments that possess three major characteristics—long hours, low pay, and unsafe or unhealthy working conditions. Sweatshops may also have policies that severely restrict workers' freedoms, including limiting bathroom breaks and even conversations with fellow workers.
http://www.encyclopedia.com/topic/Sweatshops.aspx

Business establishment that makes its employees work under harsh and often hazardous conditions, and pays only minimal or survival wages.
http://www.businessdictionary.com/definition/sweatshop.html