insert cc license logo into metadata in Aperture 3.2.4

Hi,

I'm trying to find out if I can insert a creative commons license like this: into the usage terms part of the IPTC metadata into selected photos AFTER import. I am working on a huge batch of photos by different photographers (many photos found on flickr), to be used on a website. The cc logos are available in svg, eps, png or giff.

file:///Users/worldreligions/Dropbox/panorama%202013/Downloads%20-%20Creative%20 Commons.html

'

We are aiming for the metadata to be viewable alongside the photo or when people click onto details. I cannot see how to insert this into the 'Usage', where I think it should go.

Thank you for your ideas.

Helen