Abbreviated as RSLT, the Retail Software License Terms is a term used by Microsoft to describe an end-user license agreement that governs single software titles acquired by Full Packaged Product (FPP) purchase or acquired with the purchase of a new PC from an original equipment manufacturer (OEM). An RSLT generally grants the right to install one copy of the software on one PC and generally does not grant downgrade rights.
See software licensing and EULA.
See also “Is Software Ownership the Same as Licensing?” in the Did You Know…? section of Webopedia.