Can you tell me please if we wanted to use password keeper in our company (>1000 employees) would there be a license cost?
The program is distributed under the terms of the GNU General Public License version 2 or later. The complete source code can be obtained from the Official KeePass Website.
Software under the GPL may be run for all purposes, including commercial purposes and even as a tool for creating proprietary software, for example when using GPL-licensed compilers.
I'd like to point out that this is keepass, not "password keeper". I do not think there would ever be a cost in the GNU licence, other than maintenance.
This is also mentioned in the administrative FAQ:
Of course, if you like KeePass, donations are very welcome.