Uhh, no. They would be violating the GPLv3 license under which they distributed the source. Changing the license only affects the next person acquiring the so

Uhh, no. They would be violating the GPLv3 license under which they distributed the source. Changing the license only affects the next person acquiring the source. The people who acquired it under the GPLv3 license cannot have this retroactively revoked or relicensed. If Orcale sued those parties, they would be violating the terms of the license. In the least instance they shouldn't have been distributing the source unde GPLv3 so their claim for infringement would be moot.