You can activate Lightroom only on 2 computers, however in order to work on the third machine you would need to sign out from one of them.
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You need to read the exact terms of the license.
2.4 Portable or Home Computer Use. The primary user of the Computer on which the Software is installed may install a second copy of the Software for his or her exclusive use on either a portable Computer or a Computer located at his or her home, provided the Software on the portable or home Computer is not used at the same time as the Software on the primary Computer.
If you have Lightroom installed on computers A and B, and then you uninstall a license from computer B, you could install Lightroom on the computer C, this still is fine because you have it installed on two computers A and C.
Thanks for your answer... Is that not to long to do??? And if you are not connected to internet, how does it works??
Thanks for your answer..
If you are not connected to the internet, you cannot sign in on the third computer, so you can't do this at all.