Freely redistributable software (FRS) is software that anyone is free to redistribute. The term has been used to mean two types of free to redistribute software, distinguished by the legal modifiability of the software. FRS which can be legally modified is the same as free software. Non-legally modifiable FRS is freeware, shareware or similar.
The non-modifiable FRS generally comes in the form of executable binaries and is often used by proprietary software companies and authors to showcase their work or to encourage the user to buy full products from them (in the case of shareware, demo or trial versions). Freeware that is not restricted to be obtained from a specific distributor is also FRS.