In proprietary software, an end-user license agreement (EULA) or software license agreement is the contract between the licensor and purchaser, establishing the purchaser’s right to use the software. The license may define ways under which the copy can be used, in addition to the automatic rights of the buyer including the first sale doctrine and 17 U.S.C. § 117 (freedom to use, archive, re-sale, and backup with legal restrictions).
Many form contracts are only contained in digital form, and only presented to a user as a click-through where the user must “accept”. As the user may not see the agreement until after he or she has already purchased the software, these documents may be contracts of adhesion.
Software companies often make special agreements with large businesses and government entities that include support contracts and specially drafted warranties.