Also called a confidential disclosure agreement (CDA), confidentiality agreement or secrecy agreement, it is a legal contract between at least two parties that outlines confidential materials the parties wish to share with one another for certain purposes, but wish to restrict from generalized use. In other words, it is a contract through which the parties agree not to disclose information covered by the agreement. An NDA creates a confidential relationship between the parties to protect any type of trade secret. As such, an NDA can protect non-public business information. (Note: In the case of certain governmental entities, the confidentiality of information other than trade secrets may be subject to applicable statutory requirements and, in some cases, may be required to be revealed to an outside party requesting the information. Generally, the governmental entity will include a provision in the contract to allow the seller to review a request for information the seller identifies as confidential and the seller may appeal such a decision requiring disclosure.) NDAs are commonly signed when two companies or individuals are considering doing business together and need to understand the processes used in one another's businesses solely for the purpose of evaluating the potential business relationship. NDAs can be "mutual," meaning both parties are restricted in their use of the materials provided, or they can only restrict a single party. It is also possible for an employee to sign an NDA or NDA-like agreement with a company at the time of hiring; in fact, some employment agreements will include a clause restricting "confidential information" in general. A class of systems used to secure wireless (Wi-Fi) computer networks. It was created in response to several serious weaknesses researchers found in the previous system, Wired Equivalent Privacy (WEP). WPA implements the majority of the IEEE 802.1 li standard, and was intended as an intermediate measure to take the place of WEP while 802.11i was prepared. WPA is designed to work with all wireless network interface cards, but not necessarily with first generation wireless access points. WPA2 implements the full standard, but will not work with some older network cards. Both provide good security with two significant issues. First, either WPA or WPA2 must be enabled and chosen in preference to WEP; WEP is usually presented as the first security choice in most installation instructions. Second, in the "personal" mode, the most likely choice for homes and small offices, a pass phrase is required that, for full security, must be longer than the typical 6- to 8-character passwords users are taught to employ.