This program uses error correcting protocols to send/receive
files over a dial-in serial port from a variety of programs
running under PC-DOS, CP/M, Unix, and other operating systems.

lrzsz is derived from the last unrestricted version of Chuck Forsberg's
rzsz package.  lrzsz is covered under the GNU copyleft.

WWW: https://ohse.de/uwe/software/lrzsz.html