Legality of easter egg features

for past few days, browsing internet, i've seen secret photoshop elements features, animation panel example.

 

my question is, if figure out how enable them, allowed use them or against eula?

 

edit:

 

on similar note, trick copying preferences file ps cs4 trial pse 8.0 legal?

 

how plugins claim unlock hidden functionality, elements plus?

the elements+ tools actions.

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