Yes. You can purchase SpreadsheetWEB Server Edition and host it on your own servers.
Requirements for installing SpreadsheetWEB Server Edition are listed below:
- Windows Server 2003 or above (In case you need SQLGET or SQLOPEN the server software must be at least Server 2008 R2)
- IIS 6.0 or above
- Microsoft .NET 3.5 Framework (with SP) and .NET 4.0
- Microsoft SQL Server 2005 or above
- 4GB RAM or above (Min 6 Gb RAM is required for 64 bit installations, 8 Gb is recommended)
- Minimum 2 core CPU
- Minimum 120 MB Hard disk space (Note: additional space is required if SQL Server resides on the same server)
- Windows Updates must be disabled in order to keep the consistency on features