This question was inspired by https://music.stackexchange.com/questions/113826/is-there-a-way-to-decode-triton-m1-vst-pcm-samples
Suppose a user purchases a license for virtual instrument plugin to make music with. This license includes the standard allowances to use sounds produced by plugin in a broader work, commercial or otherwise. Plugin includes several audio clips which it plays back with some fancy modifications to produce interesting sounds. These audio clips are not immediately accessible; they are contained in some other file, or perhaps encoded with a non-obvious codec.
The user wishes to take these sounds and modify them with a different virtual instrument to make other sounds. He locates the sounds, convert them to a standard format (if necessary), and uses them as he pleases, thinking that the use of these sounds is bound by the same license agreement as the plugin itself.
Let's also suppose that the license does not address the possibility that a user extracts audio data from the plugin files to use. Of course this would be illegal if the license agreement forbids it.
What law, if any, might the user be violating?
Answers specific to other countries are also welcome.