licensing - Licence for Excel Add-In -

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i've worked colleagues on excel add-in sell our customers. linked cloud database. licensing system coded in vba, that's pretty weak , potential hackers getting around vba protection able disable licence checking (code protection not such problem such).

we have been thinking of developing .dll file check licences, lack of expertise in field.

do have suggestions?

others can post .net licencing solutions....

from years microsoft component object model (com) have licence system. 1 writes code in c++ , clients use com instantiate component. com licence mechanism implement iclassfactory2 instead of iclassfactory here link https://msdn.microsoft.com/en-us/library/windows/desktop/ms680095(v=vs.85).aspx

now may "but code in vba!?". well, vba not secure, workbooks can broken into. problem source shipped inside.

compiling .net solution better executable intermediate language (il) can reverse engineered source. same problem java, 'byte code' can reverse engineered.

for robust code security need compile c++. c++ people can still reverse engineered.

the ultimate in paranoia place valued code behind web service never on user's computer.


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