Legality of transferring IPA files between people

We are currently developing an app for a client in the US, we are based in the UK. We need to "proof" the app as we make changes with our client i.e. get them to check the updates b开发者_开发问答efore we go any further.

The issue we're having is that transferring an IPA file to our client has been advised by their legal team as illegal. Is there any other way (simply) to allow our client to view this app regularly as we update it?

Cheers

IANAL, however, their legal team is wrong. When I click Build and Archive, and then Share by Email, the generated email file contains an ipa. This is an Apple-sanctioned method of doing ad-hoc sharing of iPhone apps.

What is probably confusing them is that if you're pirating apps, you use ipa files as well. However, saying that sharing ipa files is illegal is like saying sharing .exe files is illegal. Sometimes, yes. In this case: no, so long as the devices that are running it have been properly provisioned.