06-06-2007
If you are planning to release the code of your program to the rest of the world, then a demo version is redundant. If not, then you can generate a key when the program is installed and store it in some file. You can check for that file's checksum and timestamps when the file is written to and then on subsequent runs, your program should check the file and refuse to run if the checksum/size or the timestamp changes in any way.
For a user, it would be a bit more complicated, but you could go along similar lines.
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LEARN ABOUT MOJAVE
sha384sum
SHA384SUM(1) User Commands SHA384SUM(1)
NAME
sha384sum - compute and check SHA384 message digest
SYNOPSIS
sha384sum [OPTION]... [FILE]...
DESCRIPTION
Print or check SHA384 (384-bit) checksums.
With no FILE, or when FILE is -, read standard input.
-b, --binary
read in binary mode
-c, --check
read SHA384 sums from the FILEs and check them
--tag create a BSD-style checksum
-t, --text
read in text mode (default)
The following five options are useful only when verifying checksums:
--ignore-missing
don't fail or report status for missing files
--quiet
don't print OK for each successfully verified file
--status
don't output anything, status code shows success
--strict
exit non-zero for improperly formatted checksum lines
-w, --warn
warn about improperly formatted checksum lines
--help display this help and exit
--version
output version information and exit
The sums are computed as described in FIPS-180-2. When checking, the input should be a former output of this program. The default mode is
to print a line with checksum, a space, a character indicating input mode ('*' for binary, ' ' for text or where binary is insignificant),
and name for each FILE.
AUTHOR
Written by Ulrich Drepper, Scott Miller, and David Madore.
REPORTING BUGS
GNU coreutils online help: <http://www.gnu.org/software/coreutils/>
Report sha384sum translation bugs to <http://translationproject.org/team/>
COPYRIGHT
Copyright (C) 2017 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.
SEE ALSO
Full documentation at: <http://www.gnu.org/software/coreutils/sha384sum>
or available locally via: info '(coreutils) sha2 utilities'
GNU coreutils 8.28 January 2018 SHA384SUM(1)