EULA
Legal agreement to abide by software makers' terms and conditions
A EULA is a common part of the installation process of computer software, a legal document providing terms by which the user must agree to abide in using the software.
EULAs are essentially agreements between user and vendor defining the terms on which the software is provided. They often contain lists of behaviours that are inappropriate or illegal, such as copying or reselling the software without the agreement of the developer.
Some malware authors take advantage of the lengthy and often impenetrable nature of EULAs to deceive victims into agreeing to their malicious actions, giving them the appearance of legitimacy. The legal standing of EULAs, particularly those which contain clauses granting the software inappropriate rights to the user's data, is somewhat questionable in many jurisdictions.