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1. Intentional violations of or deviations from traditional forms, standards, or syntax by a writer in order to achieve a particular effect. Don't get hung up on adhering too strictly to iambic pentameter—you can use a bit of poetic license if it means preserving the meaning and rhythm you want. Any two-bit poet can string together a jumble of words and call it poetic license.
2. Minor changes to or misrepresentations of facts or history in the name of art or for the sake of an agenda. People complain about minor inaccuracies in historical dramas, but honestly they wouldn't be able to make the movies marketable without using a little poetic license.
liberties or license of the type taken by artists, especially poets, to violate patterns of rhyme, harmony, structure, etc. I couldn't tell whether he kept making spelling mistakes or if it was just poetic license.
Also, artistic license. The liberty taken by a writer or artist in deviating from conventional form or fact to achieve an effect. For example, I've never seen grass or a tree of that color; but that's artistic license. [Late 1700s]
artistic/poetic ˈlicence(often ironic) the freedom of artists or writers to change facts in order to make a story, painting, etc. more interesting or beautiful: In the book, a fair amount of artistic licence has been taken with the timing of historical events so that they fit with the story. ♢ I allowed myself a little poetic licence in describing the table as an antique.
Licence in this idiom means ‘freedom to do or say whatever you want’.