Director of Source Program at Microsoft Corporation Jon Rosenberg submitted its Shared Source License called "Microsoft Community License" to Open Source Initiative for considering it as an OSI approved Open Source License.

Apparently having an Open Source Initiative (OSI) approved license does matter.

Companies that had once shunned the official open source label while still operating as open source entities are starting to adopt a new OSI license, the Common Public Attribution License (CPAL).

The rumors are true. Microsoft (news, site) has an official open source license that was approved by the Open Source Initiative (OSI) — the Ms-PL, or Microsoft Public License. Since they have licensed their latest offering ASP.NET MVC 1.0 under the Ms-PL, we thought we would take a look at the license terms. Is there an evil catch somewhere in the terms and conditions?

The Open Source Initiative approved on July 25 its first new license in quite some time: the Common Public Attribution License, which is essentially the Mozilla Public License with a new attribution clause.

The Microsoft Permissive License, one of two licenses the software maker submitted to the Open Source Initiative for approval as open-source licenses in August, is unlikely to be approved in its current form.

Open Source Initiative board member, Simon Phipps, declared on Monday that Google’s WebM project “is not currently open source”. It was a statement based on the fact that the license used for WebM is not currently approved by the Open Source Initiative as being compliant with the Open Source Definition.

"The Open Source Initiative has announced that the OSI Board has approved the Microsoft Public License (Ms-PL) and the Microsoft Reciprocal License (Ms-RL) as satisfying the criteria of the Open Source Definition, following their submission in August..."

I’m excited today to announce that we are also releasing the ASP.NET MVC source code under the Microsoft Public License (MS-PL). MS-PL is an OSI-approved open source license. The MS-PL contains no platform restrictions and provides broad rights to modify and redistribute the source code. You can read the text of the MS-PL at:

After a lengthy consideration, the Simple Public License (SimPL) has been added to the list of approved licenses. The concern was that because the SimPL is a reciprocal license, it could create its own ghetto of code unusable by any other project. However, because it contains language that allows relicensing under the GPL v2.0 or v3.0, this will not happen.