how to protect license with PHP

[Sandro87]

Hello,
I'm planning to make a kind of CMS for which everyone would pay a little fee for license/support otherwise they can't use it.

The problem is that with PHP I can't think of something to really protect this. Whatever line of code I write with passwords/serials/remote authentications the user having access to the PHP source could easily delete it and bypass the control. Is there a solution?

e.g. there's Vbulletin completely wrote in PHP that requires a license to buy, how do they control it?

[dreamcatcher]

File encryption is the way to go. IonCube, Zend Guard & Source Guardian are examples of popular encryption systems that enable you to protect your work and create licences. These systems can lock scripts to domains and/or IP addresses.

Note that certain loaders are required to be installed for encrypted files to run, this usually involves a simple tweak to the PHP.ini file for most people or the uploading of loaders to a directory on the site.

dc

[kamperzoid]

I had the same question thank you for the reply this is gonna help me in the future.

greetz