Client's re-use of custom animations...

I created an animated gif for a client of their own invention...  a
product... and put it on the website I created for them last year...

I recently received a call from them asking if I would supply the animation
on disk, they wish to use it in some marketing presentations...

I haven't officially released the copyright on the website to them...

They also paid me a retainer (last year) to do some marketing for them, but
haven't actually used my services for the product marketing yet.

question:  do i simply allow them to use the animation wherever they choose,
or do I charge them for it?  Looking for opinions...

Thanks,
Steve

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