Sharing and Permissions of an image

I have a client who wishes to alter (crop really) some images she has on disc. She has contacted me to say when she tries, the images are uneditable because they are locked (ie: I only have permission to adjust them).

When I look at the images in Finder, and examine the information of a file, I have 'read & write' permission but the 'everyone' part of sharing and permissions is set to read only. Whilst I can change this on a per image basis, my question is how do I export the images from Aperture 3 with permission for the client (or 'everyone') to edit them in a batch?

Otherwise I am going to have to alter every image individually from everyone-read only to everyone - read&write.

All help appreciated!

Thanks in advance

C