Yes you could. The point of the order was Kodak owned the majority of the film making and developing in the US. Preventing them from selling process paid mailers was an attempt to get some competition in the market.

From:
http://www.justice.gov/atr/cases/f0000/0096.htm#9

"The markets for color film and color photofinishing in 1954 were indisputably controlled by Kodak" (J.A. 75). Kodak had over 90% of the amateur color negative film market in 1954 (J.A. 214). Kodak did the photofinishing on all of its own color film (J.A. 220-21), because it controlled the technology, and because its photofinishing was included in the cost of the film (J.A. 234).(9)

9. The customer or retail dealer mailed the exposed film to Kodak for processing, and the prints were returned by mail in two to three weeks (J.A. 219-20). Kodak did the photofinishing of color film in large laboratories, supervised by engineers, due to the sensitivity of the process (J.A. 217-19). It refused, however, to process film produced by any other company, because its equipment could be contaminated by different chemicals they used (J.A. 220-21).