Matroska is generously supported by a large number of hardware and sofware companies that are using or building Matroska / EBML enabled products. Sponsorship of Matroska is not a requirement, but does provides the rights to use to the trademarks (Matroska, MKV) and hardware/package logos to promote the support of Matroska and MKV within any or on you're products.
You can now donate money through the Sourceforge website. If you would like to send in your own currency you can use our paypal account directly to firstname.lastname@example.org. If you cannot use Paypal you can contact us directly.
If your organization derives value from Matroska, we invite you to also support us by emailing: email@example.com for more information.