Question

Since ABBYY FineReader Engine 12 Licesnsingservice.exe can be flagged as vulnerable by anti-malware software, is it necessary to have 'Write' or even 'Full Control' permissions to a folder with Licensing Service executable for the 'everyone' group?

Answer

No, it is not necessary, It is enough to have 'Read' access only for the 'Everyone' group.

And it is a correct way to limit full access for 'everyone' so the unauthorized user is not allowed to modify. However, it is essential to comply with other permission requirements for license-related folders (FineReader Engine specifications regarding the required permissions reviewed here: https://help.abbyy.com/en-us/finereaderengine/12/user_guide/specifications_systemrequirements/)