# How to require a "registration code" for the SWF to work?

**URL:** <https://forum.kirupa.com/t/how-to-require-a-registration-code-for-the-swf-to-work/123915>\
**Category:** Uncategorized\
**Created:** [September 28, 2004, 3:07pm UTC](https://forum.kirupa.com/t/how-to-require-a-registration-code-for-the-swf-to-work/123915 "2004-09-28T15:07:09Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![bchalker](https://yyz1.discourse-cdn.com/flex011/user_avatar/forum.kirupa.com/bchalker/32/441_2.png) [@bchalker](https://forum.kirupa.com/u/bchalker)\
**Post date:** [September 28, 2004, 3:07pm UTC](https://forum.kirupa.com/t/how-to-require-a-registration-code-for-the-swf-to-work/123915/1 "2004-09-28T15:07:09Z")

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I’m wanting to create a SWF file that would have a “watermark” shown unless a “registration/unlock code” is aquired which would remove the watermark. Like a shareware type file. I’ve seen this done a few times but don’t know how. One site is : [http://www.dseffects.com](http://www.dseffects.com)

They have a setup with REGSoft, and I know the registration key is passed through via FlashVars…

any ideas?