The Justice Department said on Friday that Google would be required to license the software, to continue to upgrade it and to establish firewalls to hide ITA clients' proprietary information.
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This is needed because Google intends to launch a new service providing flight search results that would compete with online travel services, the department said in court papers.
Google, the world's No. 1 Internet search engine, said in July that it would buy ITA Software for $700 million in cash. The announcement sparked concerns that travel websites such as Kayak and TripAdvisor could be deprived of ITA's software.
Disputes between Google and the online travel websites -- for example over fees -- are to be submitted to arbitration, according to court documents released by the department.
Google shares were up 0.3 percent at $581.70 on the Nasdaq on Friday afternoon.
(Reporting by Diane Bartz and Jeremy Pelofsky; Editing by Lisa Von Ahn and Matthew Lewis)