[retroflexzy]

(I'm assuming you are a Canadian student due to referring to the work as "Co-op")

In general, Canadian labour laws prohibit what are typically considered unpaid internships, although it varies slightly by province.[1][2] My understanding is that this is not the case across most of the United States.

[1]: http://www.labour.gov.on.ca/english/es/pubs/internships.php [2]: https://www.labour.gov.bc.ca/esb/igm/esa-part-1/igm-esa-s1-w...