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Full Discussion: Implementing "Time Limited, Trial" version of my program
Top Forums UNIX for Advanced & Expert Users Implementing "Time Limited, Trial" version of my program Post 302120519 by blowtorch on Wednesday 6th of June 2007 10:33:39 PM
Old 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 REDHAT

sha1sum

SHASUM(1)								FSF								 SHASUM(1)

NAME

       shasum - compute and check SHA1 message digest

SYNOPSIS

       sha1sum [OPTION] [FILE]...
       sha1sum [OPTION] --check [FILE]

DESCRIPTION

       Print or check SHA1 (160-bit) checksums.  With no FILE, or when FILE is -, read standard input.

       -b, --binary
	      read files in binary mode (default on DOS/Windows)

       -c, --check
	      check SHA1 sums against given list

       -t, --text
	      read files in text mode (default)

   The following two options are useful only when verifying checksums:
       --status
	      don't output anything, status code shows success

       -w, --warn
	      warn about improperly formated checksum lines

       --help display this help and exit

       --version
	      output version information and exit

       The sums are computed as described in FIPS-180-1.  When checking, the input should be a former output of this program.  The default mode is
       to print a line with checksum, a character indicating type (`*' for binary, ` ' for text), and name for each FILE.

AUTHOR

       Written by Ulrich Drepper and Scott Miller.

REPORTING BUGS

       Report bugs to <bug-coreutils@gnu.org>.

COPYRIGHT

       Copyright (C) 2002 Free Software Foundation, Inc.
       This is free software; see the source for copying conditions.  There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU-
       LAR PURPOSE.

SEE ALSO

       The  full documentation for shasum is maintained as a Texinfo manual.  If the info and shasum programs are properly installed at your site,
       the command

	      info shasum

       should give you access to the complete manual.

shasum (coreutils) 4.5.3					   February 2003							 SHASUM(1)
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