[keypusher]

This rules change is aimed specifically at companies such as Paizo. Pathfinder is based on 3.5e, which was covered under the OGL, and going forward they must pay 25% of their revenue to WotC, and cannot sell any content for the system outside of printed material (no video games, etc)

[dragontamer]

Only for content Paizo makes that's based off of OGL 1.1

What's WotC going to do about all the Pathfinder books out there? Round them up and burn them? Those Pathfinder books are still licensed OGL 1.0 by Paizo.

[BeefWellington]

    Only for content Paizo makes that's based off of OGL 1.1

The key here is that this is dependent on whether or not WotC can revoke the older licenses. Part of the issue here is there's a clause in OGL1.0 that suggests it's possible for WotC to come along at a later time and basically change what is considered an "authorized" license.

The language[1] is in #9:

    9. Updating the License: Wizards or its designated
    Agents may publish updated versions of this License.
    You may use any authorized version of this License
    to copy, modify and distribute any Open Game
    Content originally distributed under any version of
    this License.

This reads to me like they can come along at a later time and essentially say "OGL1.0a is no longer authorized" and thus everyone will be forced to move to 1.1 or cease any distribution of content issued under that license.

Whether that's enforceable is really down to what a court says.

[1]: https://media.wizards.com/2016/downloads/SRD-OGL_V1.1.pdf - Page 2

[pessimizer]

Who could possibly be claiming that WotC is going to go from house to house looking for already purchased material under a license that was entirely legal at the time?

Also, all copyrights and patents are monopolies. To say that D&D has a monopoly on D&D after revoking permission for the public to create content based on D&D can't be controversial.