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Submitting Licenses to Si2
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Si2 Licensed Downloads

The IP available for download from the Si2 web site may have membership as well as licensing requirements (Review Si2 Download Policies for Coalition Products).

Types of of Accounts

Please refer to How to Get An Account to see a description of the types of corporate member, corporate guest, academic member, individual guest and visior accounts available.

New Company Account

If your company is requesting a new company account from Si2, select the license(s) from the
Licenses Table which apply to the materials Si2 distributes in which you are interested. Download, print, sign, and submit the license to Si2. See the section Submitting Licenses to Si2 on this page.

Existing Company Account

To see what licenses your company has with Si2, check the section Company Info on your My Page. Please note that certain licenses have multiple versions. File downloads may require that your company has agreed to a specific version of a license.

If you want to download licensed material that is controlled by a license that your company has not agreed to, please contact your company coordinator on the Companies page. To receive license approval the coordinator should download, print, sign, and submit the license to Si2. See the section Submitting Licenses to Si2 on this page.

Submitting Licenses to Si2

The entire signed license needs to be mailed to Si2.
If you have questions about the license submission process, please
Contact Si2.

Mail licenses Si2 at:

Contracts Administration
9111 Jollyville Rd, Suite 250
Austin, TX, 78759

Emailing or Faxing

To expedite your license, Si2 will enable the license approval for your company account if you:

1) Email a scan of the final signature page to:



2) Fax the final signature page of a license to Si2.
Fax instructions:

  • To : Contracts Administration at Si2
  • FAX:     800-342-1977

NOTICE: Click Through Licenses
Si2 offers Click-Through License Approval for some licensed downloads. The following policies apply:
  • Click-Through agreements are only available to companies and individual company-type accounts on this site. Visitor accounts are not eligible.
  • If you want to download a file controlled by a Click-Through license, and your coordinator has not agreed to the license yet, you will be offered the option to 'Click-Through' and accept the agreement. NOTE: you are binding your company to the terms of the agreement. Please make sure you have the authority to do so. A notification will be mailed to your company coordinator that you have accepted the terms of the agreement.
If you are a coordinator for your company, a link is displayed in the table below for company approval on available click-through licenses.

Company coordinators can block all click-through licenses, for use by their company users, from their company coordinator panel.

License Table

Type (projects) License and Description Click-Through
(if available)
OpenAccess OpenAccess Internal Use And Distribution License V4 October 1, 2004

Si2 OpenAccess license.
Signed Only
OpenAccess Extensions OpenAccess ESG License v2.0.1 (March 15, 2017)

OpenAccess ESG License V2.0.1 (March 15, 2017) is used by OpenAccess Extensions.
As of July 31, 2017, this V2.0.1 license
REPLACES the license:
OpenAccess ESG License v 2.0 January 31, 2013.
Signed Only
OpenAccess Cadence OA_Multi-Patterning_Technology_License_11-12-12

Cadence License for the OpenAccess Multi Pattern Technology.
Click Through
Multiple Projects Apache 2.0 plus Si2 Copyright - ClickThrough

Apache 2.0 License Plus Si2 Copyright in the Appendix.
Click Through
LefDef LefDef License V2.1 January 17, 2003

Cadence Lef Def License Agreement required for downloads of Lef/Def 5.3 - 5.7 distributions which include:
  • Lef/Def Exchange Format Reference
  • Lef/Def parsers source,
  • Lef/Def C API documentation
Click Through
SPTAB Si2 SP-TAB License V1.0 (February 11. 2013)

SPTAB License covering OpenAccess release for research only.
Signed Only
CPF 2.0 Parser Si2 License V1.1 - May 17, 2011

Si2 License V1.1 is a generic license for use by Si2 project software.
Signed Only
CPF1.0 Parser Si2 CPF 1.0 Parser License 2009-04-02

As of 04-03-2009, this license is required for all downloads of the CPF 1.0 Parser.
Signed Only
CPF 1.1 Parser Si2 CPF 1.1 Parser License 2009-04-02

As of 04-03-2009, this license is required for all downloads of the CPF 1.1 Parser.
Signed Only
OpenAccess Contribution LSI Python OpenAccess License

LSI Open Source Public License 1.0 July 12, 2002
This license is required for LSI Python for OpenAccess file distributions posted prior to 2008-05. Later files require the Apache License.
Click Through
Open Modeling Distributions ECSM Specification License Agreement 03-06-06

ECSM Specification License Agreement
Click Through
Open Modeling Contribution Nangate Open Cell Library License, Version 1.0. February 20, 2008

The Nangate FreePDF45 Library uses a CLICK-THRU license.
* The signed version is for Si2 company accounts who block Click-thru licenses for their users.
* Si2 Academic Memberships are not granted for this signed license -- when a Visitor Account will suffice for such downloads.
Click Through
Contributions Common Public License Version 1.0 (click through)

Common Public License v1.0 Origin:
Click Through
Contributions Apache License, Version 2.0 (click through)

Apache License, Version 2.0 Avalable at
Click Through
Contributions BOOST License 1.0 (click-through)

BOOST License - Version 1.0 - August 17th, 2003 For use by contributions. From
Click Through

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