In the event that a client would want to part ways, and wanted to take the source files of their website with them- what's the common practice?

If it isn't noted as copywritten, does that mean it's open?

I have a client who wants to switch from another to me and part of their site is php, and there's a flash bit in there as well.

Do I have any right to request the .fla for editing, should the php code be given to the client as well by the current hosting company (whom also developed the php) ?

If it were me who was being asked to hand over the .fla file, I would be hesitant to do so. But php is code, does that make any difference?

thanks all,