6. A network device comprising: a processor to: generate a list of documents that violate a set of policy rules, the list of documents being generated based on one or more previous searches of a client device; select a search engine, of a client device, based on the search engine being determined to be available, cause the selected search engine to perform a search, of memory devices of the client device on a periodic basis, when an application is closed in the client device, and when the client device stops receiving information input by a user via the application, the search being performed based on an inputted search term, the search term being input into the selected search engine based on the set of policy rules, identify a search result, of one or more search results output by the selected search engine, that includes confidential information, the search result being identified based on an analysis of the one or more search results against the set of policy rules, determine that the list of documents does not include the identified search result, generate one or more new policy rules based on the list of documents not including the identified search result, and modify the set of policy rules to form a modified set of policy rules, the modified set of policy rules including the one or more new policy rules.
6. A network device comprising: a processor to: generate a list of documents that violate a set of policy rules, the list of documents being generated based on one or more previous searches of a client device; select a search engine, of a client device, based on the search engine being determined to be available, cause the selected search engine to perform a search, of memory devices of the client device on a periodic basis, when an application is closed in the client device, and when the client device stops receiving information input by a user via the application, the search being performed based on an inputted search term, the search term being input into the selected search engine based on the set of policy rules, identify a search result, of one or more search results output by the selected search engine, that includes confidential information, the search result being identified based on an analysis of the one or more search results against the set of policy rules, determine that the list of documents does not include the identified search result, generate one or more new policy rules based on the list of documents not including the identified search result, and modify the set of policy rules to form a modified set of policy rules, the modified set of policy rules including the one or more new policy rules. 11. The network device of claim 6 , where the processor is further to: transmit the modified set of policy rules to an external device.