[misnome]

IANAL, but reading this: - Redistributions of Source Code must retain....

Doesn't seem to me to exclude selling the source code without displaying the information up front, as long as the copyright notice is still included with the source code (which we don't know, because we don't know anyone who bought it). And I can't see the third clause being triggered, because neither the name you gave it, or your name are being used.

Edit: fceccon pointed out that the name and logo are being used in the header, so yes that seems to make it much more clear cut, albeit turning on the legal definition of "Derived"

[fceccon]

    And I can't see the third clause being triggered, because neither the name you gave it, or your name are being used.

They're using the ChatSecure logo and name on the page[1] header, so I think the third clause is triggered.

[1] http://www.chupamobile.com/products/details/600/Secured+Chat...