Firest the direcotry you post is wrong. It should read /usr/lib/vmware/licenses/site/ (s after license).
Second WoodyZ way is the correct way to insert the file. Check WS Help About to see if you have no expiration date If so you need nothing more.
Third If you want to directly edit the license file (like I used to but no more since WoodyZ pointed me to a single command) you can edit
the file /usr/lib/vmware/licenses/license-ws-90-e1-201202 by inserting the line Serial=xxxxx xxxxx xxxxx xxxxx xxxxx after the LicenseType= "Site" entry.
# VMware software license
StartFields = "Cpt, ProductID, LicenseVersion, LicenseType, LicenseEdition, Field2"
Field2 = "AdminUI, Option, Epoch"
Cpt = "COPYRIGHT (c) VMware, Inc. 1999-2012"
ProductID = "VMware Workstation"
LicenseVersion = "9.0"
LicenseType = "Site"
LicenseEdition = "ws"
AdminUI = "1"
Epoch = "2012-02-01"
Option = "3"
Data = "MaxVcpusPerVm=8;mdate=2012-02-21"
DataHash = "b84e671c-2a4eb5bf-e0c38d0d-25b47ae4-112f549e"
Hash = "d9768f64-25e5def4-2a25a89a-2f1b4cf8-afa0ccf2"
[marty@Fedora site]$ cat license-ws-90-e1-201202
# VMware software license
StartFields = "Cpt, ProductID, LicenseVersion, LicenseType, LicenseEdition, Field2"
Field2 = "AdminUI, Option, Epoch"
Cpt = "COPYRIGHT (c) VMware, Inc. 1999-2012"
ProductID = "VMware Workstation"
LicenseVersion = "9.0"
LicenseType = "Site"
LicenseEdition = "ws"
AdminUI = "1"
Epoch = "2012-02-01"
Option = "3"
Data = "MaxVcpusPerVm=8;mdate=2012-02-21"
DataHash = "b84e671c-2a4eb5bf-e0c38d0d-25b47ae4-112f549e"
Hash = "d9768f64-25e5def4-2a25a89a-2f1b4cf8-afa0ccf2"
after