Google adjusts WebM license to be more like Apache and GPL3 http://bit.ly/cJqsWt
Creating another variation on an open source license would make it difficult to bundle WebM with other software using a different license.
On Friday, Google announced that, in response to the community’s concerns, a “small change” was made to WebM’s license, restoring the “pure BSD nature” of the license as well as GPL compatibility. The change modifies the license’s patent clause to reflect the GPL3 and Apache patent clauses, which separate rights to patents from rights to copyright. Under the original license, anyone bringing patent litigation against Google would have surrendered all rights granted by the license — the new language clarifies that only patent rights would be terminated, the same penalty incurred under the GPL3 and Apache licenses.