An oxymoron: proprietary standard

I work in the mozilla.org Web evangelism group. When evangelising 
webmasters about the need to stick to the standards we  send them a  
letter based on a draft text we have prepared. I just want to send ypou 
a quote:

> I am contacting you to request that you upgrade your web site to 
> provide the same support for W3C Standards as it does for the 
> proprietary extensions found in Microsoft's Internet Explorer or 
> Netscape Navigator 4.x and to offer some resources that may help you.

Will we need to change it to "upgrade your web site to provide the same 
support *proprietary* W3C Standards as it does for the proprietary 
extensions found in Microsoft's Internet Explorer or Netscape Navigator 
4.x "?

And furher on:

>
> Supporting W3C Standards is the right thing to do because it makes 
> sure that the Internet remains accessible to users of all browsers on 
> all platforms and devices.

I'm not sure I will be able send this to anyone after the patent 
proposition is implemented.

Jacek Piskozub
mozilla.org Evangelist for Central Europe