Depending on exactly what you're asking about something may be possible. What I think you're asking, though, is not likely to do you much good. Please clarify what it is you want.

Are you wanting to write a program in Perl, distribute the source code to the operators of some web server you don't control, and have it not run once a certain date is past?

Are you wanting to have a CGI program on your own server you can have stop returning results after a certain amount of time or a certain number of total results?

Do you want to have users sign up for a web application with a username and password (or some other authentication) and stop authenticating them after some point in time?

Are you wanting to wrap your Perl program with a compiled binary program that checks some license status then decrypts your program and hands it to the interpreter?

Any of these has a different answer and different points to discuss from the others. I'm not really sure which it is you're asking, or if you're asking something else entirely.

In reply to Re: License key for script by mr_mischief
in thread License key for script by shanu_040

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.