# Calculator Plugins Licensing

The earlier licensing system of the Calculator Plugins has been recently modified. You can find information on the new licensing system below.

# The new licensing system

The new licensing system consists of 6 different licenses. The new licenses and the calculations that they cover are the following:

Structural Calculations: Charge, Conformation, Geometry, Hückel, Refractivity, Hydrogen Bond Donor/Acceptor (HBDA), Structural Frameworks calculations

Protonation: pK

_{a}, Major Microspecies, Isoelectric Point calculationsPartitioning: log

*P,*log*D,*HLB calculationsIsomers: Tautomerization, Stereoisomers, Resonance calculations

Solubility: Solubility Predictor

NMR: NMR Predictor

Being a user of the Calculator Plugins

Plugin pricing is based on the *number of users*. Notice that unlike other products, *users* are those who perform predictions OR those who make informed decisions based on the calculated/predicted properties.

Calculation Pack and All Plugin license

The Calculations Pack and All Plugin licenses are not available for purchase anymore.

Users who have the Calculations Pack licenses and would like to renew them can choose any 3 of the new licenses above.

Users who have the All Plugin licenses and would like to renew them get all new licenses.

Free calculations

Elemental Analysis calculations (e.g. molecular mass) are free and therefore their usage does not require a license in any ChemAxon product where the calculation is available.

The 2D Topological Surface Area calculation within the Geometry Group is also free. However, other calculations of the Geometry group are not free.

About the Structural Calculations license

The Structural Calculations license covers a wide selection of structural calculations grouped together from our earlier set of calculations. Individual calculations can't be purchased separately.

About the Structural Calculations license

The Charge Group contains the Charge Distribution, Polarizability and Orbital Electronegativity calculations.

The Conformer Group contains the Conformers, Molecular Dynamics and Flexible 3D Alignment calculations.

The Geometry Group contains the Topology Analysis, Geometry, 2D Topological Surface Area, 3D Molecular Surface Area calculations.