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All-In-One Protector 7

 

There are 2 different options, depending on the type of protection you need:

 

 

Protect Excel files using the All-In-One Protector Excel protection

If you developed an Excel Plug-In as a DLL, the protection is possible with Licence Protector, which is a source code integration product - see website www.Licence-Protector.com for details and download the trial version.