Are you talking about ionCube or PHPLicengine? What is the link to the page where you see the captcha?
Hi Jeff, It was for PHP License Script: http://www.phplicensescript.com That is the system I want to use, and there is also another one: http://www.protectscripts.com I tried sending both of these places emails, and registering, but can't do it. Richard.
While ago I contacted PHP License Script and requested for their free 1 week trial and no answer, It seems this is out of business, then I decided to go with PHPLicengine. I never heard of protectscripts.
Yah... I built PhpLicenseScript.com a while ago and sold it on Flippa, sadly it seems the new owner of the site has not done much to contribute to it.... Kind of a bummer cause I was very proud of that site. Heck, I still use the appication I made for it on all my scripts.
Be aware that PHPAudit is a good software, but it will take you about 2-3 months to learn how to use it. The documentation isn't that great and there are so many little things you need to do to make the easiest seeming task work.
I guess with all of the suggestions above you still have use ion cube or any other php encryption to protect your scripts. Most are very complicated to use(PHPAudit) and don't give you much protection. That's why we've developed our own licensing system which communicates with the script installer and generates unique hash keys. If you've developed many scripts and want to protect them the best possible way, I recommend a custom approach. Will be more than happy to give you some advises.
I've just released a new version of my script: PHPMyLicense.net You can license any script and then obfuscate it so its not understandable.