php - how does this "licensing" work with this software -

optimizepress wordpress plugin. own copy , use , wondering how use licensing secure product.

i consider securing own php script if it's viable.

here's secure product:

on there server download script have enter domain url in text box license plugin url.

they have 2 textboxs enter domains in: 1. if it's first time licensing sites 2. adding more sites account

then click submit button , serial code sent back

after install plugin in wordpress, must goto settings area asks enter serial code verification otherwise can't use script

how done? used php script i'll distributing?

thanks thoughts

i'm not familier script possible script using curl, serial number used authenticate account verification access account.

next pull url script being run , verify url listed on account.

from there if url not listed send fail command killing script, if url listed authenticate.

if listed script check status of license , either run or kill script.

there division in using type of model whereby developers believe if there no response auth server script should assume allowed run not interrupt user experience, others believe if auth server doesn't reply possible unauthorised usage kill activity.

there other technologies available same thing , depending on application may not suitable, have @ various licensing models.

as note, style of distribution may want use php encoder such ioncube script cannot hacked bypass authentication. in addition when writing script use api, recommend having user assign ip address, way first query api auth allowed talk server. provides lot of protection api script move on verify license valid or not.

i hope helpful you.