Greetings to all zope community. Our company is developing an application, supposed to be run under dedicated zope server, placed offline in our customers corporate environment and requested via LAN. The commerical approach is to impose a recurrent fee on our customer for using the software. Thus, application needs a renewable license mechanism. Supposedly, customer gets his updated license in some format upon successfull payment and supplies it in order to continue using the application (license should contain data like number of users, next expiration date, etc.) What would be the right way to protect this mechanism from hacking, provied that zope is an open-source platform, so any code is hypothetically accessable by the customer and apllication is run completely offline with no intercation with our information system? The required level of protection is not really high, but we need to be safe from attempts to hack the application by modest programmers at least. Thanks for inputs! -az