Hi Guys

I want to protect a woorkbook that I have used more than 300 hours to develop.

I want to protect it against copying of the program. E.g. by restricting user access to specified user list and by somehow a key or digital signature

Still the users must be able to enter data, make calculations, change in diagrams (e.g. x-y scale) and make print outs

I'm looking at XL Safe Pro from www.datasafexl.com whichs seems to be able doing the job.

This cost however 299$/year and pehaps teher are additional costs(?)..... is there any free programs doing the work?

Has anyone experiences with this Ad-In (XL Safe Pro)? Pros and cons?

Thanks

Best regards
Henrik