I'm not sure about the IRTC, but section 5b of the Povcomp rules has 
these subsections:

"Additional requirements for the winning entries"

iii) Submit a suitably sized version of their image to sponsor 
zazzle.com for display and sale, for a period of not less than 30 days, 
in the competition gallery that zazzle will establish. A royalty will be 
paid on sales made through zazzle.

iv) Agree to their image being used for marketing purposes by the 
competition and its sponsors for a period of two years, provided that 
the image is unaltered (other than applying your signature, resizing, 
recompressing it, or as otherwise agreed by you) and that credit is given.


http://www.povcomp.com/rules/


It is conceivable that some people might classify that activity as 
commercial.

Peter D.


Greg M. Johnson wrote:
> Consdier for example:
>
https://magnatune.com/artists/license/student?artist=Saros&album=Soundscapes&genre=Electronica
> 
> Which points us to:
> 
> http://creativecommons.org/licenses/by-nc-sa/1.0/legalcode 
> 
>

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