PayPal button encryption for Event Registration

Great plugin!

I was just wondering is it possible to encrypt the “Pay Now” button for using PayPal. The Paypal website advises that all buttons are encrypted to prevent fraud:

https://cms.paypal.com/uk/cgi-bin/?cmd=_render-content&content_ID=developer/e_howto_html_encryptedwebpayments

Thanks.

http://ww.wp.xz.cn/extend/plugins/event-registration/