Macro run for trial period

[Ujjawal]

I have written 12k lines of code over 2 years. I want some portion of code to be run for trial period (4 months). After that it should stop working unless the original developer of the macro wants to make it work.

What i could think off creating a reference variable that calculates difference of today's date and 2nd quarter of 2016 -

x = intck('month', date(),yyq(floor(exp(8))- 964, ceil(arcos(0.5))));

If x <= 0 then stop macro. 

It's too easy for intermediate SAS user to crack the above code. INTCK, date() functions are easy to understand. Is there any geek way to do it? Any trick with DO LOOP / SQL to create a password that works only till 2nd quarter of 2016?

Any help would be highly appreciated!

[FreelanceReinh · Accepted solution]

If you provide the macro source code to the users, they will always be able (at least in principle) to cancel your restrictions. Have you looked into the SECURE option of the %MACRO statement? This would encrypt the contents of a macro (which must be stored in a stored compiled macro library). Thus, even a straightforward check of the DATE() value would be possible, I think.