Locking a pdf file from opening

Hello,
I searched the posts first but didn't see this question asked. Is there a way to prevent a pdf file from being opened if that file is already opened by another person? It doesn't have to be done via Adobe iteself, although that would be easiest. We don't want to use passwords since a password would allow the pdf to be opened by anyone who knows the password.
Thanks for any help,
Chuck

Hi,
Something to try.
Use the search string "DRM for PDF" in the search engine of you choice.
The query return provides a phletora of possibilities.
Which provider is best for you will be a function of your specific needs and budget.
Be well...

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