MicrostockGroup

Hi everyone,
I haven't read the fine prints of pixmac (I know, I know, I should...). I wonder if they have a policy concerning the keywords they produce for our images. If I want to reuse these keywords on another site, is it ok ?
I mean, they don't have a copyright of sort on the keyword, but if I upload 100 pix there, then embed the keywords they wrote on the IPTC of my files (without added value from my part), then upload these 100 pix to 5 other sites keyworded, do I infrige on some rule or policy ?