If you purchased a single User, 5 User, or 10 User license where you have to register each individual license then you may install a second copy on say a laptop provided that you are the sole user of both machines and both machines are either owned by yourself or owned by the company.
If you purchased a 25 User or more user license then you may only have that number of licenses installed at any given time.
THINGS YOU CANNOT DO
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Install it on a shared computer that is used by more than 1 person and then install it on a second laptop or another computer.
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Install it on two users computers even if both users are not going to be using the software at the same time.
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Install it on a computer owned by the company and then install it at home on your own personal computer. Since the company owns the software it can only be installed on another computer owned by the company.
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Install it on a server or Citrix type of system where multiple users access the software. In this case you would need a license for each user that uses the software since each of their remote sessions counts as a virtual "Computer"