Use of Photography

Hello all.

So I already know that if we use a photo of a model for a flyer template, we need to direct the customer to the photo’s original location. What if I want to make a collage of free for commercial use photos? Most probably the photos will be cropped and recolored. So directing the customer to the photo’s location, will not help him/her at all. Writing down an action for each photo separately, will dramatically slow down the time needed creating the flyer, so the only solution is to just use the photo as is, and include it in the flyer, in it’s final state. The reviewer will be notified with the photo links, so he can clarify if they are free for commercial use or modification. Is this doable? What is your opinion?

Thanks in advance

if your licensed to use it, weather its a free image or not how can it be a problem ?